diff --git a/firefox/10-manual.yml b/firefox/10-manual.yml
index 316c6ce8..39f4cb2c 100644
--- a/firefox/10-manual.yml
+++ b/firefox/10-manual.yml
@@ -6,5 +6,7 @@ manual:  # Manual proxy configuration
 
   http_proxy:  # HTTP Proxy
 
-    address:  # HTTP address
+    address:
+      description: HTTP address
+      type: domainname
 ...