docs: add missing parameter doc string

diff --git a/gst/gstregistry.c b/gst/gstregistry.c
index bda2414e5f75374fed14750f4269254e00723a5d..c3e7a060b8e7eb9b36de895e7fdfeffd2c92786c 100644 (file)
--- a/gst/gstregistry.c
+++ b/gst/gstregistry.c
@@ -1660,6 +1660,7 @@ gst_update_registry (void)
 
 /**
  * gst_registry_get_feature_list_cookie:
+ * @registry: the registry
  *
  * Returns the registrys feature list cookie. This changes
  * every time a feature is added or removed from the registry.