diff --git a/proposals/4190-webxdc.md b/proposals/4190-webxdc.md
index 4be1c79f5..40ba4e72a 100644
--- a/proposals/4190-webxdc.md
+++ b/proposals/4190-webxdc.md
@@ -1,4 +1,4 @@
-# MSCXXXX: WebXDC on Matrix
+# MSC4190: WebXDC on Matrix
 
 
 In Matrix, users may want to send each other interactive content (for example a game