diff --git a/pkgs/development/libraries/haskell/tar/default.nix b/pkgs/development/libraries/haskell/tar/default.nix
index 7ee52e79e03..04257960a64 100644
--- a/pkgs/development/libraries/haskell/tar/default.nix
+++ b/pkgs/development/libraries/haskell/tar/default.nix
@@ -6,7 +6,7 @@ cabal.mkDerivation (self: {
   sha256 = "0vbsv7h3zgp30mlgsw156jkv1rqy5zbm98as9haf7x15hd6jf254";
   buildDepends = [ filepath time ];
   meta = {
-    description = "Reading, writing and manipulating \".tar\" archive files";
+    description = "Reading, writing and manipulating \".tar\" archive files.";
     license = self.stdenv.lib.licenses.bsd3;
     platforms = self.ghc.meta.platforms;
     maintainers = [ self.stdenv.lib.maintainers.andres ];