diff --git a/doc/index.md b/doc/index.md
index 5213261..354d702 100644
--- a/doc/index.md
+++ b/doc/index.md
@@ -1,5 +1,5 @@
-Developer's Guide
-----
+# Developer's Guide
+
  * [How to run from source tree](how_to_run.md)
  * [Directory Structure](directory.md)
  * [Mapping and Validation](mapping_and_validation.md)