diff --git a/glib/gutf8.c b/glib/gutf8.c
index bdc4752fd..e61d33dbc 100644
--- a/glib/gutf8.c
+++ b/glib/gutf8.c
@@ -1597,7 +1597,7 @@ fast_validate_len (const char *str,
  * g_utf8_validate:
  * @str: (array length=max_len) (element-type guint8): a pointer to character data
  * @max_len: max bytes to validate, or -1 to go until NUL
- * @end: (allow-none) (out): return location for end of valid data
+ * @end: (allow-none) (out) (transfer none): return location for end of valid data
  * 
  * Validates UTF-8 encoded text. @str is the text to validate;
  * if @str is nul-terminated, then @max_len can be -1, otherwise