From 68b7c758d8fc113b8e685e17bf18dfb9f9277e62 Mon Sep 17 00:00:00 2001
From: Zicklag <zicklag@katharostech.com>
Date: Wed, 6 May 2020 16:37:32 -0500
Subject: [PATCH] Add Instructions for Modifying User Agent List

Thanks for the note @thoop:

https://github.com/prerender/prerender-node/issues/180#issuecomment-520635160
---
 README.md | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/README.md b/README.md
index 9f9d011..eab4f08 100644
--- a/README.md
+++ b/README.md
@@ -113,7 +113,31 @@ Option to add options to the request sent to the prerender server.
 app.use(require('prerender-node').set('prerenderServerRequestOptions', {}));
 ```
 
+### `crawlerUserAgents` and `extensionsToIgnore`
 
+`prerender.crawlerUserAgents` and `prerender.extensionsToIgnore` can be customized simply by editing the data from the module directly after import. For example, to add user agents:
+
+```js
+var prerender = require('prerender-node');
+prerender.crawlerUserAgents.push("useragent1", "useragent2");
+app.use(prerender);
+```
+
+To remove certain user agents:
+
+```js
+var prerender = require('prerender-node');
+prerender.crawlerUserAgents = prerender.crawlerUserAgents.filter(function(ua) { return ua !== 'googlebot'; });
+app.use(prerender);
+```
+
+Or, to completely replace the list with your own:
+
+```js
+var prerender = require('prerender-node');
+prerender.crawlerUserAgents = [ 'facebookexternalhit' ]; //add any other user agents you'd like to support
+app.use(prerender);
+```
 
 ## Caching