diff --git a/packages/client/USAGE.md b/packages/client/USAGE.md
index 3994d2e3..3cdb50ca 100644
--- a/packages/client/USAGE.md
+++ b/packages/client/USAGE.md
@@ -1208,7 +1208,8 @@ client
 
 ```javascript
 const client = require('@sendgrid/client')
-client.setDefaultRequest('qsStringifyOptions', {arrayFormat: 'repeat'});
+const qs = require('qs')
+client.setDefaultRequest('paramsSerializer', (params) => qs.stringify(params, {arrayFormat: 'repeat'}));
 
 const request = {}
 const queryParams = {