diff --git a/clutter/clutter-transition.c b/clutter/clutter-transition.c
index 589764156..28f289e34 100644
--- a/clutter/clutter-transition.c
+++ b/clutter/clutter-transition.c
@@ -26,8 +26,8 @@
  * @Title: ClutterTransition
  * @Short_Description: Transition between two values
  *
- * #ClutterTransition is a subclass of #ClutterTimeline that computes
- * the interpolation between two values, stored by a #ClutterInterval.
+ * #ClutterTransition is an abstract subclass of #ClutterTimeline that
+ * computes the interpolation between two values, stored by a #ClutterInterval.
  */
 
 #ifdef HAVE_CONFIG_H