diff --git a/doc/APIchanges b/doc/APIchanges
index 63e973fe8c..5f3793fcdb 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -12,6 +12,9 @@ libavutil:   2009-03-08
 
 API changes, most recent first:
 
+2009-12-13 - r20829 - lavu 50.7.0 - avstring.h API
+  add av_d2str()
+
 2009-12-13 - r20826 - lavc 52.42.0 - AVStream
   add avg_frame_rate