diff --git a/pkgs/development/libraries/haskell/transformers-compat/default.nix b/pkgs/development/libraries/haskell/transformers-compat/default.nix
index 3eda20cec05..2abd6efa0ce 100644
--- a/pkgs/development/libraries/haskell/transformers-compat/default.nix
+++ b/pkgs/development/libraries/haskell/transformers-compat/default.nix
@@ -7,7 +7,7 @@ cabal.mkDerivation (self: {
   buildDepends = [ transformers ];
   meta = {
     homepage = "http://github.com/ekmett/transformers-compat/";
-    description = "Small compatibility shim exposing the new types from transformers 0.3 to older Haskell platforms";
+    description = "A small compatibility shim exposing the new types from transformers 0.3 to older Haskell platforms.";
     license = self.stdenv.lib.licenses.bsd3;
     platforms = self.ghc.meta.platforms;
   };