diff --git a/gdk/gdkframeclock.c b/gdk/gdkframeclock.c
index d8ea953d9a..44696fac53 100644
--- a/gdk/gdkframeclock.c
+++ b/gdk/gdkframeclock.c
@@ -442,8 +442,8 @@ _gdk_frame_clock_begin_frame (GdkFrameClock *frame_clock)
  * for the current frame or a recent frame. The #GdkFrameTimings
  * object may not yet be complete: see gdk_frame_timings_get_complete().
  *
- * Returns: (nullable): the #GdkFrameTimings object for the specified
- *  frame, or %NULL if it is not available. See
+ * Returns: (nullable) (transfer none): the #GdkFrameTimings object for
+ *  the specified frame, or %NULL if it is not available. See
  *  gdk_frame_clock_get_history_start().
  * Since: 3.8
  */
@@ -475,10 +475,10 @@ gdk_frame_clock_get_timings (GdkFrameClock *frame_clock,
  *
  * Gets the frame timings for the current frame.
  *
- * Returns: (nullable): the #GdkFrameTimings for the frame currently
- *  being processed, or even no frame is being processed, for the
- *  previous frame. Before any frames have been processed, returns
- *  %NULL.
+ * Returns: (nullable) (transfer none): the #GdkFrameTimings for the
+ *  frame currently being processed, or even no frame is being
+ *  processed, for the previous frame. Before any frames have been
+ *  processed, returns %NULL.
  * Since: 3.8
  */
 GdkFrameTimings *