diff --git a/gst-libs/gst/audio/audio-info.c b/gst-libs/gst/audio/audio-info.c
index b18c2d9325..2fcc6711fb 100644
--- a/gst-libs/gst/audio/audio-info.c
+++ b/gst-libs/gst/audio/audio-info.c
@@ -101,7 +101,7 @@ gst_audio_info_new (void)
 
 /**
  * gst_audio_info_init:
- * @info: a #GstAudioInfo
+ * @info: (out caller-allocates): a #GstAudioInfo
  *
  * Initialize @info with default values.
  */
@@ -181,7 +181,7 @@ gst_audio_info_set_format (GstAudioInfo * info, GstAudioFormat format,
 
 /**
  * gst_audio_info_from_caps:
- * @info: a #GstAudioInfo
+ * @info: (out caller-allocates): a #GstAudioInfo
  * @caps: a #GstCaps
  *
  * Parse @caps and update @info.
diff --git a/gst-libs/gst/video/video-info.c b/gst-libs/gst/video/video-info.c
index 1a6117dd5c..43f24350c9 100644
--- a/gst-libs/gst/video/video-info.c
+++ b/gst-libs/gst/video/video-info.c
@@ -117,7 +117,7 @@ static gboolean fill_planes (GstVideoInfo * info,
 
 /**
  * gst_video_info_init:
- * @info: a #GstVideoInfo
+ * @info: (out caller-allocates): a #GstVideoInfo
  *
  * Initialize @info with default values.
  */
@@ -385,7 +385,7 @@ gst_video_field_order_from_string (const gchar * order)
 
 /**
  * gst_video_info_from_caps:
- * @info: a #GstVideoInfo
+ * @info: (out caller-allocates): #GstVideoInfo
  * @caps: a #GstCaps
  *
  * Parse @caps and update @info.