diff --git a/source.go b/source.go
index 94b7ee5..8874445 100644
--- a/source.go
+++ b/source.go
@@ -11,14 +11,21 @@ import (
 	"gitoa.ru/go-4devs/log/field"
 )
 
+const funcName = "Logger"
+
 func WithSource(items int, trimPath func(string) string) Middleware {
 	const (
-		skip       = 4
-		funcPrefix = "gitoa.ru/go-4devs/log.Logger"
-		skipHelper = "gitoa.ru/go-4devs/log."
+		skip    = 4
+		pkgName = "gitoa.ru/go-4devs/log"
 	)
 
+	return WithCallers(items, skip, pkgName, trimPath)
+}
+
+func WithCallers(items, skip int, logPkg string, trimPath func(string) string) Middleware {
 	items += skip
+	skipHelper := logPkg + "."
+	funcPrefix := skipHelper + funcName
 
 	return func(ctx context.Context, data *entry.Entry, handler Logger) (int, error) {
 		pc := make([]uintptr, items)