diff --git a/DOCS/tech/mpcf.txt b/DOCS/tech/mpcf.txt
index 419f529f5c..c8698495b3 100644
--- a/DOCS/tech/mpcf.txt
+++ b/DOCS/tech/mpcf.txt
@@ -451,6 +451,7 @@ name
 	"CreationTime"	"2003-01-20 20:13:15Z", ... 
 			(ISO 8601 format, see http://www.cl.cam.ac.uk/~mgk25/iso-time.html)
 			Note: dont forget the timezone
+	"ReplayGain"
 	"Keywords"
 	Note: if someone needs some others, please tell us about them, so we can
 	      add them to the official standard (if they are sane)