README.md in hellosign-ruby-sdk-3.0.7 vs README.md in hellosign-ruby-sdk-3.0.9

@@ -24,12 +24,12 @@
   config.api_key = 'api_key'
   # You can use email_address and password instead of api_key. But api_key is recommended
   # If api_key, email_address and password are all present, api_key will be used
   # config.email_address = 'email_address'
   # config.password = 'password'
-  config.client_id = 'your_cliend_id' #required only when you want to use embedded or OAuth
-  config.client_secret = 'your_cliend_secret' #required only when you want to use OAuth
+  config.client_id = 'your_client_id' #required only when you want to use embedded or OAuth
+  config.client_secret = 'your_client_secret' #required only when you want to use OAuth
 end
 ```
 
 ##Usage
 When you have configured your app like above, you can start using it:
@@ -53,5 +53,10 @@
 
 ##Testing
 
 Testing relies on built in hard-coded fixtures. You can run the tests without affecting your actual account data. To do so
 from the root of your project run <code>rake spec</code>.
+
+## Additional notes
+
+### Local callbacks
+We do not allow app callbacks (event or OAuth) to be set to localhost. However it is still possible to test callbacks against a local server. Tunneling services such as ngrok (http://ngrok.com) can help you set this up.