diff --git a/gst-libs/gst/app/gstappsink.c b/gst-libs/gst/app/gstappsink.c
index ecec3b56f1..f6408d65af 100644
--- a/gst-libs/gst/app/gstappsink.c
+++ b/gst-libs/gst/app/gstappsink.c
@@ -1093,7 +1093,8 @@ gst_app_sink_get_drop (GstAppSink * appsink)
  * This function blocks until a preroll sample or EOS is received or the appsink
  * element is set to the READY/NULL state.
  *
- * Returns: a #GstBuffer or NULL when the appsink is stopped or EOS.
+ * Returns: (transfer full): a #GstSample or NULL when the appsink is stopped or EOS.
+ *          Call gst_sample_unref() after usage.
  */
 GstSample *
 gst_app_sink_pull_preroll (GstAppSink * appsink)
@@ -1161,7 +1162,8 @@ not_started:
  * If an EOS event was received before any buffers, this function returns
  * %NULL. Use gst_app_sink_is_eos () to check for the EOS condition.
  *
- * Returns: a #GstBuffer or NULL when the appsink is stopped or EOS.
+ * Returns: (transfer full): a #GstSample or NULL when the appsink is stopped or EOS.
+ *          Call gst_sample_unref() after usage.
  */
 
 GstSample *