diff --git a/gst/gstsample.c b/gst/gstsample.c
index 74632f25ea..3194a80692 100644
--- a/gst/gstsample.c
+++ b/gst/gstsample.c
@@ -79,10 +79,10 @@ _gst_sample_free (GstSample * sample)
 
 /**
  * gst_sample_new:
- * @buffer: a #GstBuffer
- * @caps: a #GstCaps
- * @segment: a #GstSegment
- * @info: a #GstStructure
+ * @buffer: (transfer none) (allow-none): a #GstBuffer, or NULL
+ * @caps: (transfer none) (allow-none): a #GstCaps, or NULL
+ * @segment: transfer none) (allow-none): a #GstSegment, or NULL
+ * @info: (transfer full) (allow-none): a #GstStructure, or NULL
  *
  * Create a new #GstSample with the provided details.
  *