diff --git a/doc/api/http.markdown b/doc/api/http.markdown
index bfdeb86406aa..7807099dec07 100644
--- a/doc/api/http.markdown
+++ b/doc/api/http.markdown
@@ -457,6 +457,7 @@ automatically parsed with [url.parse()][].
 
 Options:
 
+- `protocol`: Protocol to use. Defaults to `'http:'`.
 - `host`: A domain name or IP address of the server to issue the request to.
   Defaults to `'localhost'`.
 - `hostname`: To support `url.parse()` `hostname` is preferred over `host`