diff --git a/files/en-us/web/api/client/postmessage/index.md b/files/en-us/web/api/client/postmessage/index.md
index a732ea1b8703887..11c7025dd0fe2f4 100644
--- a/files/en-us/web/api/client/postmessage/index.md
+++ b/files/en-us/web/api/client/postmessage/index.md
@@ -18,6 +18,7 @@ message is received in the "`message`" event on
 
 ```js-nolint
 postMessage(message)
+postMessage(message, options)
 postMessage(message, transferables)
 ```
 
@@ -25,10 +26,10 @@ postMessage(message, transferables)
 
 - `message`
   - : The message to send to the client. This can be any [structured-cloneable type](/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm).
+- `options` {{optional_inline}}
+  - : An optional object containing a `transfer` field with an [array](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array) of [transferable objects](/en-US/docs/Web/API/Web_Workers_API/Transferable_objects) to transfer ownership of. The ownership of these objects is given to the destination side and they are no longer usable on the sending side.
 - `transferables` {{optional_inline}}
-  - : A sequence of objects that are [transferred](/en-US/docs/Web/API/Web_Workers_API/Transferable_objects) with the message. The
-    ownership of these objects is given to the destination side and they are no longer
-    usable on the sending side.
+  - : An optional [array](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array) of [transferable objects](/en-US/docs/Web/API/Web_Workers_API/Transferable_objects) to transfer ownership of. The ownership of these objects is given to the destination side and they are no longer usable on the sending side.
 
 ### Return value