diff --git a/src/Hamming/App/Types.hs b/src/Hamming/App/Types.hs
index e3527b0..f51aa9f 100644
--- a/src/Hamming/App/Types.hs
+++ b/src/Hamming/App/Types.hs
@@ -27,16 +27,17 @@ License along with this program.  If not, see
 {-# LANGUAGE TemplateHaskell #-}
 
 module Hamming.App.Types (
-  -- * AppState
+  -- * Application state data
+  -- ** AppState
   AppState (..),
-  -- ** Lenses
+  -- *** Lenses
   appMode,
   hammingCode,
-  -- * AppMode
+  -- ** AppMode
   AppMode (..),
-  -- * EditState,
+  -- ** EditState,
   EditState (..),
-  -- ** Lenses
+  -- *** Lenses
   rowNum,
   colNum,
   -- * Other Types