diff --git a/doc/index.md b/doc/index.md
index a6dc97eb2..e03ceb909 100644
--- a/doc/index.md
+++ b/doc/index.md
@@ -162,7 +162,7 @@ unable to access their previously-stored files.
 If your application is new, or has never previously stored files in the
 persistent filesystem, then the "Library" setting is generally recommended.
 
-### Firefox OS Quirks
+## Firefox OS Quirks
 
 The File System API is not natively supported by Firefox OS and is implemented
 as a shim on top of indexedDB.