diff --git a/working/doc/spec/kmac.md b/working/doc/spec/kmac.md
index 62b2346..dd529ef 100644
--- a/working/doc/spec/kmac.md
+++ b/working/doc/spec/kmac.md
@@ -1,4 +1,4 @@
-# KMAC
+## KMAC
 
 KMAC is a family of message authentication codes based on KECCAK, as defined
 in [NIST SP800-185].