diff --git a/src/Data/Heap.hs b/src/Data/Heap.hs
index e66915c..16c97a5 100644
--- a/src/Data/Heap.hs
+++ b/src/Data/Heap.hs
@@ -1,3 +1,7 @@
+{-
+Module : Data.Heap
+Description : A model heap used by abstract machine
+-}
 module Data.Heap
     ( Heap
     , Addr