diff --git a/doc/evolution.md b/doc/evolution.md
index 05af4ab..f9c574c 100644
--- a/doc/evolution.md
+++ b/doc/evolution.md
@@ -34,7 +34,7 @@ for direct control. AnviLLM established what the filesystem surface could
 unlock; its limitations clarified what the runtime must own. This log begins
 with that lineage.
 
-How the Ollie system-of-systems emerged and evolved.
+## How the Ollie system-of-systems emerged and evolved.
 
 This is a study log. It records what was built, what was killed, and why —
 in the order it happened. The dead ends are as instructive as the survivors: