docs: add simple doc blurb

diff --git a/gst/gstsystemclock.h b/gst/gstsystemclock.h
index 7e13cfa..c78845c 100644 (file)
--- a/gst/gstsystemclock.h
+++ b/gst/gstsystemclock.h
@@ -47,6 +47,8 @@ typedef struct _GstSystemClockPrivate GstSystemClockPrivate;
  * @GST_CLOCK_TYPE_REALTIME: time since Epoch
  * @GST_CLOCK_TYPE_MONOTONIC: monotonic time since some unspecified starting
  *                            point
+ *
+ * The different kind of clocks.
  */
 typedef enum {
   GST_CLOCK_TYPE_REALTIME      = 0,