diff --git a/giobjectinfo.c b/giobjectinfo.c
index efb9ad76d..3f3423ccb 100644
--- a/giobjectinfo.c
+++ b/giobjectinfo.c
@@ -89,7 +89,7 @@ g_object_info_get_field_offset (GIObjectInfo *info,
  *
  * Obtain the parent of the object type.
  *
- * Returns: (transfer full): the #GIObjectInfo. Free the struct by calling
+ * Returns: (transfer full) (nullable): the #GIObjectInfo. Free the struct by calling
  * g_base_info_unref() when done.
  */
 GIObjectInfo *