diff --git a/pkgs/development/libraries/haskell/multirec/default.nix b/pkgs/development/libraries/haskell/multirec/default.nix
index f30caeb2fb1..5783ea5410a 100644
--- a/pkgs/development/libraries/haskell/multirec/default.nix
+++ b/pkgs/development/libraries/haskell/multirec/default.nix
@@ -1,12 +1,13 @@
-{cabal}:
+{cabal} :
 
 cabal.mkDerivation (self : {
   pname = "multirec";
-  version = "0.5";
-  sha256 = "1nrfbiy5g51cpaqqi1adrr32x74wjjvplyyrphvzf4rxhnhj3xpw";
+  version = "0.5.1";
+  sha256 = "0y62gb2ml0799a3f1ny5ydjc4rjwj1dgs48f5fj6hf2fpl4hk02l";
   noHaddock = true; # don't know why Haddock causes an error
   meta = {
-    description = "Generic programming with systems of recursive datatypes";
+    homepage = "http://www.cs.uu.nl/wiki/GenericProgramming/Multirec";
+    description = "Generic programming for families of recursive datatypes";
+    license = self.stdenv.lib.licenses.bsd3;
   };
 })
-
diff --git a/pkgs/development/libraries/haskell/zipper/default.nix b/pkgs/development/libraries/haskell/zipper/default.nix
index 36dbc389fb7..1ee59122a43 100644
--- a/pkgs/development/libraries/haskell/zipper/default.nix
+++ b/pkgs/development/libraries/haskell/zipper/default.nix
@@ -1,12 +1,13 @@
-{cabal, multirec}:
+{cabal, multirec} :
 
 cabal.mkDerivation (self : {
   pname = "zipper";
-  version = "0.3";
-  sha256 = "3f6cc0ea69734d0523f1bf74d14953f88a196e728f89a7cc91f394d9e0c13c15";
-  propagatedBuildInputs = [multirec];
+  version = "0.3.1";
+  sha256 = "170qjc3mbk6i96z5js745ix57i0xkgpa5h9xjiiirq9x6bfbbqyp";
+  propagatedBuildInputs = [ multirec ];
   meta = {
-    description = "Generic zipper for systems of recursive datatypes";
+    homepage = "http://www.cs.uu.nl/wiki/GenericProgramming/Multirec";
+    description = "Generic zipper for families of recursive datatypes";
+    license = self.stdenv.lib.licenses.bsd3;
   };
 })
-