diff --git a/bip-0031.md b/bip-0031.md
index e0dabefb..3252fca2 100644
--- a/bip-0031.md
+++ b/bip-0031.md
@@ -1,5 +1,5 @@
 <pre>
-  BIP: 32
+  BIP: 31
   Title: Pong message
   Author: Mike Hearn <hearn@google.com>
   Status: Draft