diff --git a/README.md b/README.md
index bc8f285..e42fce2 100644
--- a/README.md
+++ b/README.md
@@ -183,9 +183,9 @@ The `@ratelimit` decorator enforces strict rate limits while `@hoptcha_protected
 You can override the default iframe and style using the optional onCaptcha parameter in the hoptchaPost() JavaScript function. This is useful if you want to match your app’s branding or use modals.
 
 ```javascript
-hoptchaPost('/endpoint', payload, onSuccess, onError, function renderCustom(url, key) {
+hoptchaPost('/endpoint', payload, onSuccess, onError, function renderCustom(url) {
     // Replace container with your custom implementation
-    $('#myCustomCaptchaArea').html(`<iframe src="${url}?client_key=${key}"></iframe>`);
+    $('#myCustomCaptchaArea').html(`<iframe src="${url}"></iframe>`);
 });
 ```