diff --git a/pkgs/development/libraries/haskell/RSA/default.nix b/pkgs/development/libraries/haskell/RSA/default.nix
index 17f4c516a546..c5257c5b2620 100644
--- a/pkgs/development/libraries/haskell/RSA/default.nix
+++ b/pkgs/development/libraries/haskell/RSA/default.nix
@@ -12,7 +12,7 @@ cabal.mkDerivation (self: {
     binary cryptoApi cryptoPubkeyTypes monadcryptorandom pureMD5 SHA
   ];
   meta = {
-    description = "Implementation of RSA, using the padding schemes of PKCS#1 v2.1";
+    description = "Implementation of RSA, using the padding schemes of PKCS#1 v2.1.";
     license = self.stdenv.lib.licenses.bsd3;
     platforms = self.ghc.meta.platforms;
     maintainers = [ self.stdenv.lib.maintainers.andres ];