diff --git a/gst-libs/gst/app/gstappsink.c b/gst-libs/gst/app/gstappsink.c
index cfcb1bf6d2..fed56a5e5f 100644
--- a/gst-libs/gst/app/gstappsink.c
+++ b/gst-libs/gst/app/gstappsink.c
@@ -1499,7 +1499,7 @@ gst_app_sink_get_wait_on_eos (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: (transfer full): a #GstSample or NULL when the appsink is stopped or EOS.
+ * Returns: (transfer full) (nullable): a #GstSample or NULL when the appsink is stopped or EOS.
  *          Call gst_sample_unref() after usage.
  */
 GstSample *
@@ -1524,7 +1524,7 @@ gst_app_sink_pull_preroll (GstAppSink * appsink)
  * 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: (transfer full): a #GstSample or NULL when the appsink is stopped or EOS.
+ * Returns: (transfer full) (nullable): a #GstSample or NULL when the appsink is stopped or EOS.
  *          Call gst_sample_unref() after usage.
  */
 GstSample *
@@ -1558,7 +1558,7 @@ gst_app_sink_pull_sample (GstAppSink * appsink)
  * This function blocks until a preroll sample or EOS is received, the appsink
  * element is set to the READY/NULL state, or the timeout expires.
  *
- * Returns: (transfer full): a #GstSample or NULL when the appsink is stopped or EOS or the timeout expires.
+ * Returns: (transfer full) (nullable): a #GstSample or NULL when the appsink is stopped or EOS or the timeout expires.
  *          Call gst_sample_unref() after usage.
  *
  * Since: 1.10
@@ -1654,8 +1654,8 @@ not_started:
  * this function returns %NULL. Use gst_app_sink_is_eos () to check for the EOS
  * condition.
  *
- * Returns: (transfer full): a #GstSample or NULL when the appsink is stopped or EOS or the timeout expires.
- * Call gst_sample_unref() after usage.
+ * Returns: (transfer full) (nullable): a #GstSample or NULL when the appsink is stopped or EOS or the timeout expires.
+ *          Call gst_sample_unref() after usage.
  *
  * Since: 1.10
  */