diff --git a/pkgs/development/libraries/haskell/datetime/default.nix b/pkgs/development/libraries/haskell/datetime/default.nix
index 669bace3366..faf0b40b94d 100644
--- a/pkgs/development/libraries/haskell/datetime/default.nix
+++ b/pkgs/development/libraries/haskell/datetime/default.nix
@@ -7,7 +7,7 @@ cabal.mkDerivation (self: {
   buildDepends = [ QuickCheck time ];
   meta = {
     homepage = "http://github.com/esessoms/datetime";
-    description = "Utilities to make Data.Time.* easier to use";
+    description = "Utilities to make Data.Time.* easier to use.";
     license = "GPL";
     platforms = self.ghc.meta.platforms;
     maintainers = [ self.stdenv.lib.maintainers.andres ];