diff --git a/thumbnail.cabal b/thumbnail.cabal
--- a/thumbnail.cabal
+++ b/thumbnail.cabal
@@ -1,5 +1,5 @@
 Name:                thumbnail
-Version:             0.4
+Version:             0.5
 Synopsis:            generate thumbnail image
 Description:         generate thumbnail image
 Homepage:            https://github.com/cutsea110/thumbnail
@@ -9,7 +9,12 @@
 Maintainer:          cutsea110@gmail.com
 Category:            Graphics
 Build-type:          Simple
-Cabal-version:       >=1.2
+Cabal-version:       >=1.6
+
+Source-Repository head
+  type:              git
+  location:          http://github.com/cutsea110/thumbnail
+
 Library
   Exposed-modules:   Graphics.Thumbnail
   Build-depends:     base >= 4.0 && < 5.0