diff --git a/specs/simpleserialize.md b/specs/simpleserialize.md
index 238d7699a..12d0c8dd4 100644
--- a/specs/simpleserialize.md
+++ b/specs/simpleserialize.md
@@ -1,4 +1,4 @@
-# SimpleSerialize (SSZ) Spec
+# [WIP] SimpleSerialize (SSZ) Spec
 
 ***Work In Progress***