diff --git a/spa/include/spa/buffer/meta.h b/spa/include/spa/buffer/meta.h
index 844a8a256..2f77d8dd5 100644
--- a/spa/include/spa/buffer/meta.h
+++ b/spa/include/spa/buffer/meta.h
@@ -168,9 +168,10 @@ struct spa_meta_videotransform {
  * Metadata to describe the time on the timeline when the buffer
  * can be acquired and when it can be reused.
  *
- * This metadata will usually also require negotiation of 2 extra
- * buffer datas of type SPA_DATA_SyncObj with 2 fds for the acquire
- * and release timelines respectively.
+ * This metadata will require negotiation of 2 extra fds for the acquire
+ * and release timelines respectively.  One way to achieve this is to place
+ * this metadata as SPA_PARAM_BUFFERS_metaType when negotiating a buffer
+ * layout with 2 extra fds.
  */
 struct spa_meta_sync_timeline {
 	uint32_t flags;