diff --git a/learn-physics.cabal b/learn-physics.cabal
--- a/learn-physics.cabal
+++ b/learn-physics.cabal
@@ -1,5 +1,5 @@
 Name:                learn-physics
-Version:             0.3
+Version:             0.3.1
 Synopsis:            Haskell code for learning physics
 Description:         A library of functions for vector calculus,
                      calculation of electric field, electric flux,
@@ -37,3 +37,7 @@
                        not-gloss >= 0.5.0.4 && < 0.7,
                        spatial-math >= 0.1.7 && < 0.3
   Hs-source-dirs:      src
+
+Source-repository head
+  type:                darcs
+  location:            http://hub.darcs.net/scottwalck/learn-physics