diff --git a/firefox/20-manual.yml b/firefox/20-manual.yml
index e52459e..11f30ac 100644
--- a/firefox/20-manual.yml
+++ b/firefox/20-manual.yml
@@ -15,4 +15,11 @@ manual:
   socks_proxy:
     description: SOCKS Proxy
     type: proxy
+
+    version:
+      description: SOCKS host version used by proxy
+      choices:
+        - v4
+        - v5
+      default: v5
 ...