diff --git a/Marlin/Conditionals_LCD.h b/Marlin/Conditionals_LCD.h
index b1a5b5a054..19c7f81092 100644
--- a/Marlin/Conditionals_LCD.h
+++ b/Marlin/Conditionals_LCD.h
@@ -205,7 +205,7 @@
     #ifndef LCD_HEIGHT
       #define LCD_HEIGHT 4
     #endif
-  #else //no panel but just LCD
+  #else // no panel but just LCD
     #if ENABLED(ULTRA_LCD)
       #ifndef LCD_WIDTH
         #define LCD_WIDTH 16
@@ -392,4 +392,4 @@
   #define HAS_RESUME_CONTINUE (ENABLED(NEWPANEL) || ENABLED(EMERGENCY_PARSER))
   #define HAS_COLOR_LEDS (ENABLED(BLINKM) || ENABLED(RGB_LED) || ENABLED(RGBW_LED))
 
-#endif //CONDITIONALS_LCD_H
+#endif // CONDITIONALS_LCD_H
diff --git a/Marlin/Marlin.h b/Marlin/Marlin.h
index a5c2b81c21..b10541b061 100644
--- a/Marlin/Marlin.h
+++ b/Marlin/Marlin.h
@@ -429,4 +429,4 @@ void do_blocking_move_to_xy(const float &x, const float &y, const float &fr_mm_s
   bool axis_unhomed_error(const bool x, const bool y, const bool z);
 #endif
 
-#endif //MARLIN_H
+#endif // MARLIN_H
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 0cb90c9689..4047adb52b 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -788,7 +788,7 @@ extern "C" {
     return free_memory;
   }
 }
-#endif //!SDSUPPORT
+#endif // !SDSUPPORT
 
 #if ENABLED(DIGIPOT_I2C)
   extern void digipot_i2c_set_current(int channel, float current);
@@ -1841,7 +1841,7 @@ static void clean_up_after_endstop_or_probe_move() {
       do_blocking_move_to_z(z_dest);
   }
 
-#endif //HAS_BED_PROBE
+#endif // HAS_BED_PROBE
 
 #if HAS_PROBING_PROCEDURE || HOTENDS > 1 || ENABLED(Z_PROBE_ALLEN_KEY) || ENABLED(Z_PROBE_SLED) || ENABLED(NOZZLE_CLEAN_FEATURE) || ENABLED(NOZZLE_PARK_FEATURE) || ENABLED(DELTA_AUTO_CALIBRATION)
 
@@ -3208,7 +3208,7 @@ void unknown_command_error() {
     next_busy_signal_ms = ms + host_keepalive_interval * 1000UL;
   }
 
-#endif //HOST_KEEPALIVE_FEATURE
+#endif // HOST_KEEPALIVE_FEATURE
 
 bool position_is_reachable(const float target[XYZ]
   #if HAS_BED_PROBE
@@ -3421,7 +3421,7 @@ inline void gcode_G4() {
     );
   }
 
-#endif //FWRETRACT
+#endif // FWRETRACT
 
 #if ENABLED(NOZZLE_CLEAN_FEATURE)
   /**
@@ -7032,7 +7032,7 @@ inline void gcode_M111() {
     inline void gcode_M129() { baricuda_e_to_p_pressure = 0; }
   #endif
 
-#endif //BARICUDA
+#endif // BARICUDA
 
 /**
  * M140: Set bed temperature
@@ -9385,7 +9385,7 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
     for (uint8_t j = 0; j < MIXING_STEPPERS; j++)
       mixing_factor[j] = mixing_virtual_tool_mix[tmp_extruder][j];
 
-  #else //!MIXING_EXTRUDER || MIXING_VIRTUAL_TOOLS <= 1
+  #else // !MIXING_EXTRUDER || MIXING_VIRTUAL_TOOLS <= 1
 
     #if HOTENDS > 1
 
@@ -9677,7 +9677,7 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
     SERIAL_ECHO_START;
     SERIAL_ECHOLNPAIR(MSG_ACTIVE_EXTRUDER, (int)active_extruder);
 
-  #endif //!MIXING_EXTRUDER || MIXING_VIRTUAL_TOOLS <= 1
+  #endif // !MIXING_EXTRUDER || MIXING_VIRTUAL_TOOLS <= 1
 }
 
 /**
@@ -9968,7 +9968,7 @@ void process_next_command() {
 
         case 928: // M928: Start SD write
           gcode_M928(); break;
-      #endif //SDSUPPORT
+      #endif // SDSUPPORT
 
       case 31: // M31: Report time since the start of SD print or last M109
         gcode_M31(); break;
diff --git a/Marlin/blinkm.cpp b/Marlin/blinkm.cpp
index c495a5debd..1caf0a071e 100644
--- a/Marlin/blinkm.cpp
+++ b/Marlin/blinkm.cpp
@@ -42,5 +42,5 @@ void SendColors(byte red, byte grn, byte blu) {
   Wire.endTransmission();
 }
 
-#endif //BLINKM
+#endif // BLINKM
 
diff --git a/Marlin/boards.h b/Marlin/boards.h
index 14f1d27a10..32165f53cc 100644
--- a/Marlin/boards.h
+++ b/Marlin/boards.h
@@ -98,4 +98,4 @@
 
 #define MB(board) (MOTHERBOARD==BOARD_##board)
 
-#endif //__BOARDS_H
+#endif // __BOARDS_H
diff --git a/Marlin/cardreader.cpp b/Marlin/cardreader.cpp
index a37389e457..5681660d25 100644
--- a/Marlin/cardreader.cpp
+++ b/Marlin/cardreader.cpp
@@ -54,7 +54,7 @@ CardReader::CardReader() {
   //power to SD reader
   #if SDPOWER > -1
     OUT_WRITE(SDPOWER, HIGH);
-  #endif //SDPOWER
+  #endif // SDPOWER
 
   next_autostart_ms = millis() + 5000;
 }
@@ -882,4 +882,4 @@ void CardReader::printingHasFinished() {
   }
 }
 
-#endif //SDSUPPORT
+#endif // SDSUPPORT
diff --git a/Marlin/cardreader.h b/Marlin/cardreader.h
index 05e8ecf077..ca29682738 100644
--- a/Marlin/cardreader.h
+++ b/Marlin/cardreader.h
@@ -183,6 +183,6 @@ extern CardReader card;
 
 #define IS_SD_PRINTING (false)
 
-#endif //SDSUPPORT
+#endif // SDSUPPORT
 
-#endif //__CARDREADER_H
+#endif // __CARDREADER_H
diff --git a/Marlin/configuration_store.cpp b/Marlin/configuration_store.cpp
index 99495997b8..997922550b 100644
--- a/Marlin/configuration_store.cpp
+++ b/Marlin/configuration_store.cpp
@@ -418,7 +418,7 @@ void MarlinSettings::postprocess() {
       EEPROM_WRITE(ubl_active);
       EEPROM_WRITE(dummy);
       EEPROM_WRITE(eeprom_slot);
-    #endif //AUTO_BED_LEVELING_UBL
+    #endif // AUTO_BED_LEVELING_UBL
 
     // 9 floats for DELTA / Z_DUAL_ENDSTOPS
     #if ENABLED(DELTA)
@@ -795,7 +795,7 @@ void MarlinSettings::postprocess() {
         EEPROM_READ(dummyb);
         EEPROM_READ(dummy);
         EEPROM_READ(dummyui8);
-      #endif //AUTO_BED_LEVELING_UBL
+      #endif // AUTO_BED_LEVELING_UBL
 
       #if ENABLED(DELTA)
         EEPROM_READ(endstop_adj);               // 3 floats
diff --git a/Marlin/digipot_mcp4451.cpp b/Marlin/digipot_mcp4451.cpp
index 9c5e8d025b..419d3a423f 100644
--- a/Marlin/digipot_mcp4451.cpp
+++ b/Marlin/digipot_mcp4451.cpp
@@ -76,4 +76,4 @@ void digipot_i2c_init() {
     digipot_i2c_set_current(i, digipot_motor_current[i]);
 }
 
-#endif //DIGIPOT_I2C
+#endif // DIGIPOT_I2C
diff --git a/Marlin/endstop_interrupts.h b/Marlin/endstop_interrupts.h
index 642f78a58b..7d37c77c66 100644
--- a/Marlin/endstop_interrupts.h
+++ b/Marlin/endstop_interrupts.h
@@ -203,4 +203,4 @@ void setup_endstop_interrupts( void ) {
   // If we arrive here without raising an assertion, each pin has either an EXT-interrupt or a PCI.
 }
 
-#endif //_ENDSTOP_INTERRUPTS_H_
+#endif // _ENDSTOP_INTERRUPTS_H_
diff --git a/Marlin/language.h b/Marlin/language.h
index f377ce2480..1294eb6b6c 100644
--- a/Marlin/language.h
+++ b/Marlin/language.h
@@ -305,4 +305,4 @@
 
 #include "language_en.h"
 
-#endif //__LANGUAGE_H
+#endif // __LANGUAGE_H
diff --git a/Marlin/macros.h b/Marlin/macros.h
index a943e9cb54..8badc5c85a 100644
--- a/Marlin/macros.h
+++ b/Marlin/macros.h
@@ -183,4 +183,4 @@
 #define RECIPROCAL(x) (NEAR_ZERO(x) ? 0.0 : 1.0 / (x))
 #define FIXFLOAT(f) (f + 0.00001)
 
-#endif //__MACROS_H
+#endif // __MACROS_H
diff --git a/Marlin/mesh_bed_leveling.cpp b/Marlin/mesh_bed_leveling.cpp
index 08fdd3f861..3da19d97ed 100644
--- a/Marlin/mesh_bed_leveling.cpp
+++ b/Marlin/mesh_bed_leveling.cpp
@@ -47,4 +47,4 @@
     ZERO(z_values);
   }
 
-#endif  // MESH_BED_LEVELING
+#endif // MESH_BED_LEVELING
diff --git a/Marlin/mesh_bed_leveling.h b/Marlin/mesh_bed_leveling.h
index b2d503b4b7..41ba2677c1 100644
--- a/Marlin/mesh_bed_leveling.h
+++ b/Marlin/mesh_bed_leveling.h
@@ -119,4 +119,4 @@
 
   extern mesh_bed_leveling mbl;
 
-#endif  // MESH_BED_LEVELING
+#endif // MESH_BED_LEVELING
diff --git a/Marlin/nozzle.h b/Marlin/nozzle.h
index 6b3b4a1a23..944dd5d21d 100644
--- a/Marlin/nozzle.h
+++ b/Marlin/nozzle.h
@@ -32,7 +32,7 @@
                   nozzle_clean_length = fabs(nozzle_clean_start_point[X_AXIS] - nozzle_clean_end_point[X_AXIS]), //abs x size of wipe pad
                   nozzle_clean_height = fabs(nozzle_clean_start_point[Y_AXIS] - nozzle_clean_end_point[Y_AXIS]); //abs y size of wipe pad
   constexpr bool nozzle_clean_horizontal = nozzle_clean_length >= nozzle_clean_height; //whether to zig-zag horizontally or vertically
-#endif //NOZZLE_CLEAN_FEATURE
+#endif // NOZZLE_CLEAN_FEATURE
 
 /**
  * @brief Nozzle class
diff --git a/Marlin/pins.h b/Marlin/pins.h
index 7458d8ceff..aef1083b9c 100644
--- a/Marlin/pins.h
+++ b/Marlin/pins.h
@@ -568,4 +568,4 @@
   #define SS_PIN   AVR_SS_PIN
 #endif
 
-#endif //__PINS_H
+#endif // __PINS_H
diff --git a/Marlin/pins_SAV_MKI.h b/Marlin/pins_SAV_MKI.h
index c2ad006317..019139d1e2 100644
--- a/Marlin/pins_SAV_MKI.h
+++ b/Marlin/pins_SAV_MKI.h
@@ -131,7 +131,7 @@
   // For LCD SHIFT register LCD
   #define SR_DATA_PIN         EXT_AUX_SDA_D1
   #define SR_CLK_PIN          EXT_AUX_SCL_D0
-#endif  // SAV_3DLCD
+#endif // SAV_3DLCD
 
 #if ENABLED(SAV_3DLCD) || ENABLED(SAV_3DGLCD)
   #define BTN_EN1            EXT_AUX_A1_IO
diff --git a/Marlin/planner.cpp b/Marlin/planner.cpp
index f95d8ab6ef..af6808fa20 100644
--- a/Marlin/planner.cpp
+++ b/Marlin/planner.cpp
@@ -392,7 +392,7 @@ void Planner::recalculate() {
     thermalManager.setTargetHotend(t, 0);
   }
 
-#endif //AUTOTEMP
+#endif // AUTOTEMP
 
 /**
  * Maintain fans, paste extruder pressure,
@@ -487,7 +487,7 @@ void Planner::check_axes_activity() {
         KICKSTART_FAN(2);
       #endif
 
-    #endif //FAN_KICKSTART_TIME
+    #endif // FAN_KICKSTART_TIME
 
     #if ENABLED(FAN_SOFT_PWM)
       #if HAS_FAN0
diff --git a/Marlin/servo.cpp b/Marlin/servo.cpp
index bfe24c8b6d..3536571c17 100644
--- a/Marlin/servo.cpp
+++ b/Marlin/servo.cpp
@@ -221,7 +221,7 @@ static void finISR(timer16_Sequence_t timer) {
           , OCIE3A);    // disable the timer3 output compare A interrupt
       timerDetach(TIMER3OUTCOMPAREA_INT);
     }
-  #else //!WIRING
+  #else // !WIRING
     // For arduino - in future: call here to a currently undefined function to reset the timer
     UNUSED(timer);
   #endif
diff --git a/Marlin/stepper.cpp b/Marlin/stepper.cpp
index ff6d85f849..08612b4906 100644
--- a/Marlin/stepper.cpp
+++ b/Marlin/stepper.cpp
@@ -1398,7 +1398,7 @@ void Stepper::report_positions() {
     //delay(10);
   }
 
-#endif //HAS_DIGIPOTSS
+#endif // HAS_DIGIPOTSS
 
 #if HAS_DIGIPOTSS || HAS_MOTOR_CURRENT_PWM
 
diff --git a/Marlin/stopwatch.h b/Marlin/stopwatch.h
index 735983891c..ae3c998fb1 100644
--- a/Marlin/stopwatch.h
+++ b/Marlin/stopwatch.h
@@ -114,4 +114,4 @@ class Stopwatch {
     #endif
 };
 
-#endif //STOPWATCH_H
+#endif // STOPWATCH_H
diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index 6021d899ad..8193d3c964 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -601,7 +601,7 @@ float Temperature::get_pid_output(int e) {
       }
     #else
       pid_output = constrain(target_temperature[HOTEND_INDEX], 0, PID_MAX);
-    #endif //PID_OPENLOOP
+    #endif // PID_OPENLOOP
 
     #if ENABLED(PID_DEBUG)
       SERIAL_ECHO_START;
@@ -615,7 +615,7 @@ float Temperature::get_pid_output(int e) {
         SERIAL_ECHOPAIR(MSG_PID_DEBUG_CTERM, cTerm[HOTEND_INDEX]);
       #endif
       SERIAL_EOL;
-    #endif //PID_DEBUG
+    #endif // PID_DEBUG
 
   #else /* PID off */
     pid_output = (current_temperature[HOTEND_INDEX] < target_temperature[HOTEND_INDEX]) ? PID_MAX : 0;
@@ -662,11 +662,11 @@ float Temperature::get_pid_output(int e) {
       SERIAL_ECHO(iTerm_bed);
       SERIAL_ECHOPGM(" dTerm ");
       SERIAL_ECHOLN(dTerm_bed);
-    #endif //PID_BED_DEBUG
+    #endif // PID_BED_DEBUG
 
     return pid_output;
   }
-#endif //PIDTEMPBED
+#endif // PIDTEMPBED
 
 /**
  * Manage heating activities for extruder hot-ends and a heated bed
@@ -818,7 +818,7 @@ void Temperature::manage_heater() {
         WRITE_HEATER_BED(LOW);
       }
     #endif
-  #endif //TEMP_SENSOR_BED != 0
+  #endif // TEMP_SENSOR_BED != 0
 }
 
 #define PGM_RD_W(x)   (short)pgm_read_word(&x)
@@ -1188,7 +1188,7 @@ void Temperature::init() {
         bed_minttemp_raw -= OVERSAMPLENR;
       #endif
     }
-  #endif //BED_MINTEMP
+  #endif // BED_MINTEMP
   #ifdef BED_MAXTEMP
     while (analog2tempBed(bed_maxttemp_raw) > BED_MAXTEMP) {
       #if HEATER_BED_RAW_LO_TEMP < HEATER_BED_RAW_HI_TEMP
@@ -1197,7 +1197,7 @@ void Temperature::init() {
         bed_maxttemp_raw += OVERSAMPLENR;
       #endif
     }
-  #endif //BED_MAXTEMP
+  #endif // BED_MAXTEMP
 
   #if ENABLED(PROBING_HEATERS_OFF)
     paused = false;
@@ -1454,7 +1454,7 @@ void Temperature::disable_all_heaters() {
     return (int)max6675_temp;
   }
 
-#endif //HEATER_0_USES_MAX6675
+#endif // HEATER_0_USES_MAX6675
 
 /**
  * Get raw temperatures
@@ -2056,7 +2056,7 @@ void Temperature::isr() {
         babystepsTodo[axis]++; //fewer to do next time
       }
     }
-  #endif //BABYSTEPPING
+  #endif // BABYSTEPPING
 
   #if ENABLED(PINS_DEBUGGING)
     extern bool endstop_monitor_flag;
diff --git a/Marlin/twibus.cpp b/Marlin/twibus.cpp
index c59e79dc9f..d4822f1d26 100644
--- a/Marlin/twibus.cpp
+++ b/Marlin/twibus.cpp
@@ -201,4 +201,4 @@ void TWIBus::flush() {
 
 #endif
 
-#endif //EXPERIMENTAL_I2CBUS
+#endif // EXPERIMENTAL_I2CBUS
diff --git a/Marlin/twibus.h b/Marlin/twibus.h
index 3b606571cf..b93cd1c4ca 100644
--- a/Marlin/twibus.h
+++ b/Marlin/twibus.h
@@ -239,4 +239,4 @@ class TWIBus {
     #endif
 };
 
-#endif //TWIBUS_H
+#endif // TWIBUS_H
diff --git a/Marlin/ultralcd.cpp b/Marlin/ultralcd.cpp
index 83cd045278..60771a5f51 100644
--- a/Marlin/ultralcd.cpp
+++ b/Marlin/ultralcd.cpp
@@ -291,7 +291,7 @@ uint16_t max_display_update_time = 0;
         _MENU_ITEM_PART_2(type, ## __VA_ARGS__); \
       } while(0)
 
-  #else  // !ENCODER_RATE_MULTIPLIER
+  #else // !ENCODER_RATE_MULTIPLIER
     #define ENCODER_RATE_MULTIPLY(F) NOOP
   #endif // !ENCODER_RATE_MULTIPLIER
 
@@ -301,10 +301,10 @@ uint16_t max_display_update_time = 0;
   #if ENABLED(ENCODER_RATE_MULTIPLIER)
     #define MENU_MULTIPLIER_ITEM_EDIT(type, label, ...) MENU_MULTIPLIER_ITEM(setting_edit_ ## type, label, PSTR(label), ## __VA_ARGS__)
     #define MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(type, label, ...) MENU_MULTIPLIER_ITEM(setting_edit_callback_ ## type, label, PSTR(label), ## __VA_ARGS__)
-  #else //!ENCODER_RATE_MULTIPLIER
+  #else // !ENCODER_RATE_MULTIPLIER
     #define MENU_MULTIPLIER_ITEM_EDIT(type, label, ...) MENU_ITEM(setting_edit_ ## type, label, PSTR(label), ## __VA_ARGS__)
     #define MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(type, label, ...) MENU_ITEM(setting_edit_callback_ ## type, label, PSTR(label), ## __VA_ARGS__)
-  #endif //!ENCODER_RATE_MULTIPLIER
+  #endif // !ENCODER_RATE_MULTIPLIER
 
   /**
    * START_SCREEN_OR_MENU generates init code for a screen or menu
@@ -568,10 +568,10 @@ void lcd_status_screen() {
           }
         #else
           expire_status_ms = 0;
-        #endif //SDSUPPORT
+        #endif // SDSUPPORT
       }
     #endif
-  #endif //LCD_PROGRESS_BAR
+  #endif // LCD_PROGRESS_BAR
 
   lcd_implementation_status_screen();
 
@@ -614,7 +614,7 @@ void lcd_status_screen() {
 
     feedrate_percentage = constrain(feedrate_percentage, 10, 999);
 
-  #endif //ULTIPANEL
+  #endif // ULTIPANEL
 }
 
 /**
@@ -848,7 +848,7 @@ void kill_screen(const char* lcd_msg) {
           MENU_ITEM(gcode, MSG_INIT_SDCARD, PSTR("M21")); // Manually initialize the SD-card via user interface
         #endif
       }
-    #endif //SDSUPPORT
+    #endif // SDSUPPORT
 
     #if ENABLED(LCD_INFO_MENU)
       MENU_ITEM(submenu, MSG_INFO_MENU, lcd_info_menu);
@@ -1061,7 +1061,7 @@ void kill_screen(const char* lcd_msg) {
     //
     #if HOTENDS == 1
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE, &thermalManager.target_temperature[0], 0, HEATER_0_MAXTEMP - 15, watch_temp_callback_E0);
-    #else //HOTENDS > 1
+    #else // HOTENDS > 1
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N1, &thermalManager.target_temperature[0], 0, HEATER_0_MAXTEMP - 15, watch_temp_callback_E0);
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N2, &thermalManager.target_temperature[1], 0, HEATER_1_MAXTEMP - 15, watch_temp_callback_E1);
       #if HOTENDS > 2
@@ -2191,7 +2191,7 @@ void kill_screen(const char* lcd_msg) {
       enqueue_and_echo_command(cmd);
     }
 
-  #endif //PID_AUTOTUNE_MENU
+  #endif // PID_AUTOTUNE_MENU
 
   #if ENABLED(PIDTEMP)
 
@@ -2360,7 +2360,7 @@ void kill_screen(const char* lcd_msg) {
         PID_MENU_ITEMS("", 0);
       #endif // !PID_PARAMS_PER_HOTEND || HOTENDS == 1
 
-    #endif //PIDTEMP
+    #endif // PIDTEMP
 
     //
     // Preheat Material 1 conf
@@ -2724,7 +2724,7 @@ void kill_screen(const char* lcd_msg) {
       END_MENU();
     }
 
-  #endif //SDSUPPORT
+  #endif // SDSUPPORT
 
   #if ENABLED(LCD_INFO_MENU)
 
@@ -3285,7 +3285,7 @@ void kill_screen(const char* lcd_msg) {
       lcdDrawUpdate = LCDVIEW_CLEAR_CALL_REDRAW;
     }
 
-  #endif //SDSUPPORT
+  #endif // SDSUPPORT
 
   void menu_action_setting_edit_bool(const char* pstr, bool* ptr) {UNUSED(pstr); *ptr ^= true; lcdDrawUpdate = LCDVIEW_CLEAR_CALL_REDRAW; }
   void menu_action_setting_edit_callback_bool(const char* pstr, bool* ptr, screenFunc_t callback) {
@@ -3483,7 +3483,7 @@ void lcd_update() {
       );
     }
 
-  #endif //SDSUPPORT && SD_DETECT_PIN
+  #endif // SDSUPPORT && SD_DETECT_PIN
 
   const millis_t ms = millis();
   if (ELAPSED(ms, next_lcd_update_ms)
@@ -3533,12 +3533,12 @@ void lcd_update() {
                   SERIAL_ECHOPAIR("  ENCODER_10X_STEPS_PER_SEC: ", ENCODER_10X_STEPS_PER_SEC);
                   SERIAL_ECHOPAIR("  ENCODER_100X_STEPS_PER_SEC: ", ENCODER_100X_STEPS_PER_SEC);
                   SERIAL_EOL;
-                #endif //ENCODER_RATE_MULTIPLIER_DEBUG
+                #endif // ENCODER_RATE_MULTIPLIER_DEBUG
               }
 
               lastEncoderMovementMillis = ms;
             } // encoderRateMultiplierEnabled
-          #endif //ENCODER_RATE_MULTIPLIER
+          #endif // ENCODER_RATE_MULTIPLIER
 
           encoderPosition += (encoderDiff * encoderMultiplier) / ENCODER_PULSES_PER_STEP;
           encoderDiff = 0;
@@ -3829,7 +3829,7 @@ void lcd_reset_alert_level() { lcd_status_message_level = 0; }
         #endif
       #else
         GET_BUTTON_STATES(buttons);
-      #endif //!NEWPANEL
+      #endif // !NEWPANEL
 
     } // next_button_update_ms
 
diff --git a/Marlin/ultralcd.h b/Marlin/ultralcd.h
index 0b32c09b6c..fbc5e1c4a6 100644
--- a/Marlin/ultralcd.h
+++ b/Marlin/ultralcd.h
@@ -148,7 +148,7 @@
     #define LCD_CLICKED false
   #endif
 
-#else //no LCD
+#else // no LCD
   inline void lcd_update() {}
   inline void lcd_init() {}
   inline bool lcd_hasstatus() { return false; }
diff --git a/Marlin/ultralcd_impl_DOGM.h b/Marlin/ultralcd_impl_DOGM.h
index 0db02992b9..9c36573c52 100644
--- a/Marlin/ultralcd_impl_DOGM.h
+++ b/Marlin/ultralcd_impl_DOGM.h
@@ -874,4 +874,4 @@ static void lcd_implementation_status_screen() {
 
 #endif // ULTIPANEL
 
-#endif //__ULTRALCD_IMPL_DOGM_H
+#endif // __ULTRALCD_IMPL_DOGM_H
diff --git a/Marlin/ultralcd_impl_HD44780.h b/Marlin/ultralcd_impl_HD44780.h
index 0e92079d68..0cb0d524f8 100644
--- a/Marlin/ultralcd_impl_HD44780.h
+++ b/Marlin/ultralcd_impl_HD44780.h
@@ -101,7 +101,7 @@ extern volatile uint8_t buttons;  //an extended version of the last checked butt
     #define LCD_CLICKED ((buttons & B_MI) || (buttons & B_ST))
   #endif
 
-#endif //ULTIPANEL
+#endif // ULTIPANEL
 
 ////////////////////////////////////
 // Create LCD class instance and chipset-specific information
@@ -675,7 +675,7 @@ static void lcd_implementation_status_screen() {
         LCD_TEMP(thermalManager.degBed(), thermalManager.degTargetBed(), LCD_STR_BEDTEMP[0]);
       #endif
 
-    #endif  // HOTENDS > 1 || TEMP_SENSOR_BED != 0
+    #endif // HOTENDS > 1 || TEMP_SENSOR_BED != 0
 
   #endif // LCD_WIDTH >= 20
 
diff --git a/Marlin/ultralcd_st7920_u8glib_rrd.h b/Marlin/ultralcd_st7920_u8glib_rrd.h
index 5cc36907f7..edefbc93d0 100644
--- a/Marlin/ultralcd_st7920_u8glib_rrd.h
+++ b/Marlin/ultralcd_st7920_u8glib_rrd.h
@@ -186,5 +186,5 @@ class U8GLIB_ST7920_128X64_RRD : public U8GLIB {
 
 #pragma GCC reset_options
 
-#endif //U8GLIB_ST7920
-#endif //ULCDST7920_H
+#endif // U8GLIB_ST7920
+#endif // ULCDST7920_H
diff --git a/Marlin/watchdog.cpp b/Marlin/watchdog.cpp
index ce8e832b61..fe20b89e90 100644
--- a/Marlin/watchdog.cpp
+++ b/Marlin/watchdog.cpp
@@ -51,6 +51,6 @@ void watchdog_init() {
     kill(PSTR("ERR:Please Reset")); //kill blocks //16 characters so it fits on a 16x2 display
     while (1); //wait for user or serial reset
   }
-#endif //WATCHDOG_RESET_MANUAL
+#endif // WATCHDOG_RESET_MANUAL
 
-#endif //USE_WATCHDOG
+#endif // USE_WATCHDOG