diff --git a/proposals/3820-rooms-v11.md b/proposals/3820-rooms-v11.md
index 84243825c..5438d0680 100644
--- a/proposals/3820-rooms-v11.md
+++ b/proposals/3820-rooms-v11.md
@@ -1,4 +1,4 @@
-# MSC3604: Room Version 11
+# MSC3820: Room Version 11
 
 A new room version, `11`, is proposed using [room version 10](https://spec.matrix.org/v1.7/rooms/v10/) as a base
 and incorporating the following MSCs: