diff --git a/nselib/url.lua b/nselib/url.lua
index 775dd1e53..b6ed13af1 100644
--- a/nselib/url.lua
+++ b/nselib/url.lua
@@ -9,6 +9,7 @@
 -- * <code>authority</code>
 -- * <code>userinfo</code>
 -- * <code>path</code>
+-- * <code>port</code>
 -- * <code>password</code>
 -- These correspond to these parts of a URL (some may be <code>nil</code>):
 -- <code>