diff --git a/mail-server.nix b/mail-server.nix
index a087ae0..222b7c3 100644
--- a/mail-server.nix
+++ b/mail-server.nix
@@ -85,7 +85,7 @@ in {
       alias-users = mkOption {
         type = attrsOf (listOf str);
         description =
-          "Map of alias user to list of users who should receive email..";
+          "Map of alias user to list of users who should receive email.";
         default = { };
       };
     };