diff --git a/docs/api/protocol.md b/docs/api/protocol.md
index da5604b1fe7c..a7bf536ce625 100644
--- a/docs/api/protocol.md
+++ b/docs/api/protocol.md
@@ -28,9 +28,12 @@ of the `app` module gets emitted.
 
 The `protocol` module has the following methods:
 
-### `protocol.registerStandardSchemes(schemes)`
+### `protocol.registerStandardSchemes(schemes[, options])`
 
 * `schemes` String[] - Custom schemes to be registered as standard schemes.
+* `options` Object (optional)
+  * `secure` Boolean (optional) - `true` to register the scheme as secure.
+    Default `false`.
 
 A standard scheme adheres to what RFC 3986 calls [generic URI
 syntax](https://tools.ietf.org/html/rfc3986#section-3). For example `http` and