diff --git a/modules/validation/helpers.go b/modules/validation/helpers.go
index af21681d38..827f52bb8a 100644
--- a/modules/validation/helpers.go
+++ b/modules/validation/helpers.go
@@ -94,7 +94,7 @@ func IsValidExternalTrackerURLFormat(uri string) bool {
 
 var (
 	validUsernamePattern   = regexp.MustCompile(`^[\da-zA-Z][-.\w]*$`)
-	invalidUsernamePattern = regexp.MustCompile(`[-._]{2,}|[-._]$`)
+	invalidUsernamePattern = regexp.MustCompile(`[-._]{2,}|[-._]$`) // No consecutive or trailing non-alphanumeric chars 
 )
 
 // IsValidUsername checks if username is valid