systemclock: add Since markers for new API

diff --git a/gst/gstsystemclock.c b/gst/gstsystemclock.c
index f71d420..ec32adf 100644 (file)
--- a/gst/gstsystemclock.c
+++ b/gst/gstsystemclock.c
@@ -293,6 +293,8 @@ gst_system_clock_get_property (GObject * object, guint prop_id, GValue * value,
  * clock.
  *
  * MT safe.
+ *
+ * Since: 1.4
  */
 void
 gst_system_clock_set_default (GstClock * new_clock)