diff --git a/doc/directory.md b/doc/directory.md
index 77cc4d3..a18040d 100644
--- a/doc/directory.md
+++ b/doc/directory.md
@@ -1,3 +1,5 @@
+# Directory Structure
+
 GitBucket persists all data into __HOME/.gitbucket__ in default (In 1.9 or before, HOME/gitbucket is default).
 
 This directory has following structure: