diff --git a/draft-ietf-wimse-s2s-protocol.md b/draft-ietf-wimse-s2s-protocol.md
index 6ae239f..dede2f7 100644
--- a/draft-ietf-wimse-s2s-protocol.md
+++ b/draft-ietf-wimse-s2s-protocol.md
@@ -680,6 +680,6 @@ the Message Signature-based alternative.
 
 <cref>TODO acknowledge.</cref>
 
-## Contributors
+Contributors
 
 * Ken McCracken, Google, kenmccracken@google.com