Add docs

readme.md

@@ -518,7 +518,10 @@ This also accepts an `object` with the following fields to constrain the duratio
 - `socket` starts when the socket is connected. See [request.setTimeout](https://nodejs.org/api/http.html#http_request_settimeout_timeout_callback).
 - `response` starts when the request has been written to the socket and ends when the response headers are received.
 - `send` starts when the socket is connected and ends with the request has been written to the socket.
-- `request` starts when the request is initiated and ends when the response's end event fires.
+- `request` starts when the request is initiated and ends when the response's `end` event fires.
+- `read` starts when the `response` event is emitted and ends when the response's `end` event fires.
+
+**Note:** The `read` timeout is blocked by https://github.com/nodejs/node/issues/35923
 
 ###### retry