diff --git a/specs/XI2proto.txt b/specs/XI2proto.txt
index 1a93c8d..b6707b3 100644
--- a/specs/XI2proto.txt
+++ b/specs/XI2proto.txt
@@ -2,6 +2,7 @@ The X Input Extension
 =====================
 
                                 Version 2.0
+                                Version 2.1
 
                               Peter Hutterer
                          peter.hutterer@redhat.com