diff --git a/default.nix b/default.nix
index cc97d20..6e12d26 100644
--- a/default.nix
+++ b/default.nix
@@ -655,7 +655,7 @@ in
       };
       description = ''
         To forward mails to an external address. For instance,
-        the value {`"user@example.com" = "user@elsewhere.com";}`
+        the value `{ "user@example.com" = "user@elsewhere.com"; }`
         means that mails to `user@example.com` are forwarded to
         `user@elsewhere.com`. The difference with the
         {option}`mailserver.extraVirtualAliases` option is that `user@elsewhere.com`