diff --git a/index.js b/index.js
index 76fe08e..599b0ef 100644
--- a/index.js
+++ b/index.js
@@ -337,3 +337,12 @@ prerender.set = function(name, value) {
   this[name] = value;
   return this;
 };
+
+prerender.addUserAgents = function(newAgents) {
+  if (Array.isArray(newAgents)) {
+    this.crawlerUserAgents = this.crawlerUserAgents.concat(newAgents);
+  } else if (typeof newAgents === 'string') {
+    this.crawlerUserAgents.push(newAgents);
+  }
+  return this;
+}
diff --git a/package-lock.json b/package-lock.json
index b752fe0..0995876 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "prerender-node",
-  "version": "3.8.0",
+  "version": "3.8.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "prerender-node",
-      "version": "3.8.0",
+      "version": "3.8.1",
       "license": "MIT",
       "devDependencies": {
         "mocha": "^6.2.0",
diff --git a/package.json b/package.json
index a92f2cb..7f3927a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "prerender-node",
-  "version": "3.8.0",
+  "version": "3.8.1",
   "description": "express middleware for serving prerendered javascript-rendered pages for SEO",
   "author": "Todd Hooper",
   "license": "MIT",
diff --git a/test/index-spec.js b/test/index-spec.js
index ca42bb6..8617ada 100644
--- a/test/index-spec.js
+++ b/test/index-spec.js
@@ -578,4 +578,25 @@ describe ('Prerender', function(){
 
     });
   });
+  
+  describe('#addUserAgents', function() {
+    it('should add a single user agent', function() {
+      prerender.addUserAgents('NewBot/1.0');
+      assert(prerender.crawlerUserAgents.includes('NewBot/1.0'));
+    });
+    it('should add multiple user agents', function() {
+      prerender.addUserAgents(['BotOne/1.0', 'BotTwo/2.0']);
+      assert(prerender.crawlerUserAgents.includes('BotOne/1.0'));
+      assert(prerender.crawlerUserAgents.includes('BotTwo/2.0'));
+    });
+    it('should not add duplicates', function() {
+      prerender.addUserAgents('NewBot/1.0');
+      prerender.addUserAgents('NewBot/1.0');
+      assert.equal(prerender.crawlerUserAgents.filter(agent => agent === 'NewBot/1.0').length, 1);
+    });
+    it('should return the prerender instance', function() {
+      var result = prerender.addUserAgents('AnotherBot/1.0');
+      assert.equal(result, prerender);
+    });
+  });
 });