diff --git a/specs/simple-serialize.md b/specs/simple-serialize.md
index 7f6866cb5..565b0d788 100644
--- a/specs/simple-serialize.md
+++ b/specs/simple-serialize.md
@@ -33,7 +33,7 @@ This is a **work in progress** describing typing, serialization and Merkleizatio
 * **list**: ordered variable-length homogenous collection of values
     * angle braket notation `[]`, e.g. `uint64[]`
 
-#### Aliases
+### Aliases
 
 For convenience we alias: