diff --git a/src/arvcamera.c b/src/arvcamera.c
index 0e679b300..3913b02cb 100644
--- a/src/arvcamera.c
+++ b/src/arvcamera.c
@@ -884,7 +884,7 @@ arv_camera_abort_acquisition (ArvCamera *camera, GError **error)
  *   Continuous acquisition mode for later operations, using arv_camera_set_acquisition_mode().</para>
  * </warning>
  *
- * Returns: (transfer full): A new #ArvBuffer, NULL on error. The returned buffer must be freed using
+ * Returns: (transfer full) (nullable): A new #ArvBuffer, NULL on error or if timed out. The returned buffer must be freed using
  * [method@GObject.Object.unref].
  *
  * Since: 0.8.0
diff --git a/src/arvstream.c b/src/arvstream.c
index 99ad41f83..2b1d68890 100644
--- a/src/arvstream.c
+++ b/src/arvstream.c
@@ -141,7 +141,7 @@ arv_stream_pop_buffer (ArvStream *stream)
  *
  * This method is thread safe.
  *
- * Returns: (transfer full): a #ArvBuffer, NULL if no buffer is available.
+ * Returns: (transfer full) (nullable): a #ArvBuffer, NULL if no buffer is available.
  *
  * Since: 0.2.0
  */
@@ -166,7 +166,7 @@ arv_stream_try_pop_buffer (ArvStream *stream)
  *
  * This method is thread safe.
  *
- * Returns: (transfer full): a #ArvBuffer, NULL if no buffer is available until the timeout occurs.
+ * Returns: (transfer full) (nullable): a #ArvBuffer, NULL if no buffer is available until the timeout occurs.
  *
  * Since: 0.2.0
  */