diff --git a/pkgs/development/libraries/haskell/arithmoi/default.nix b/pkgs/development/libraries/haskell/arithmoi/default.nix
index 22707c04e83..181937fdd80 100644
--- a/pkgs/development/libraries/haskell/arithmoi/default.nix
+++ b/pkgs/development/libraries/haskell/arithmoi/default.nix
@@ -7,7 +7,7 @@ cabal.mkDerivation (self: {
   buildDepends = [ mtl random ];
   meta = {
     homepage = "https://bitbucket.org/dafis/arithmoi";
-    description = "Basic number theoretic functions and utilities";
+    description = "Efficient basic number-theoretic functions. Primes, powers, integer logarithms.";
     license = self.stdenv.lib.licenses.mit;
     platforms = self.ghc.meta.platforms;
   };