diff --git a/gst/rtsp-server/rtsp-media-mapping.c b/gst/rtsp-server/rtsp-media-mapping.c
index 5943c3032a..5e4c8d5005 100644
--- a/gst/rtsp-server/rtsp-media-mapping.c
+++ b/gst/rtsp-server/rtsp-media-mapping.c
@@ -123,7 +123,7 @@ gst_rtsp_media_mapping_find_factory (GstRTSPMediaMapping * mapping,
  * gst_rtsp_media_mapping_add_factory:
  * @mapping: a #GstRTSPMediaMapping
  * @path: a mount point
- * @factory: a #GstRTSPMediaFactory
+ * @factory: (transfer full): a #GstRTSPMediaFactory
  *
  * Attach @factory to the mount point @path in @mapping.
  *