diff --git a/app/Http/Controllers/AccountController.php b/app/Http/Controllers/AccountController.php
index a3c37bb1033a..4c6e67893f97 100644
--- a/app/Http/Controllers/AccountController.php
+++ b/app/Http/Controllers/AccountController.php
@@ -901,7 +901,26 @@ class AccountController extends BaseController
 
             if (Input::get('custom_link') == 'subdomain') {
                 $subdomain = preg_replace('/[^a-zA-Z0-9_\-\.]/', '', substr(strtolower(Input::get('subdomain')), 0, MAX_SUBDOMAIN_LENGTH));
-                $exclude = ['www', 'app', 'mail', 'admin', 'blog', 'user', 'contact', 'payment', 'payments', 'billing', 'invoice', 'business', 'owner', 'info', 'ninja'];
+                $exclude = [
+                    'www',
+                    'app',
+                    'mail',
+                    'admin',
+                    'blog',
+                    'user',
+                    'contact',
+                    'payment',
+                    'payments',
+                    'billing',
+                    'invoice',
+                    'business',
+                    'owner',
+                    'info',
+                    'ninja',
+                    'docs',
+                    'doc',
+                    'documents'
+                ];
                 $rules['subdomain'] = "unique:accounts,subdomain,{$user->account_id},id|not_in:" . implode(',', $exclude);
             } else {
                 $iframeURL = preg_replace('/[^a-zA-Z0-9_\-\:\/\.]/', '', substr(strtolower(Input::get('iframe_url')), 0, MAX_IFRAME_URL_LENGTH));