diff --git a/pkgs/development/libraries/haskell/dotgen/default.nix b/pkgs/development/libraries/haskell/dotgen/default.nix
index f56db8f8c5f5..a7fe5b791f0d 100644
--- a/pkgs/development/libraries/haskell/dotgen/default.nix
+++ b/pkgs/development/libraries/haskell/dotgen/default.nix
@@ -7,7 +7,7 @@ cabal.mkDerivation (self: {
   isLibrary = true;
   isExecutable = true;
   meta = {
-    description = "A simple interface for building .dot graph files";
+    description = "A simple interface for building .dot graph files.";
     license = self.stdenv.lib.licenses.bsd3;
     platforms = self.ghc.meta.platforms;
     maintainers = [ self.stdenv.lib.maintainers.andres ];