README.md in omniauth-constantcontact2-1.0.1 vs README.md in omniauth-constantcontact2-1.0.2

- old
+ new

@@ -2,10 +2,12 @@
 
 This gem is an OmniAuth 2.0 Strategy for the [ConstantContact API](http://http://community.constantcontact.com/t5/Documentation/Authentication-using-OAuth-2-0-new-October-2011/ba-p/38313)
 
 It supports the OmniAuth REST API which uses OAuth 2.0
 
+Many thanks to [Caleb Clark](https://github.com/calebclark/omniauth-constantcontact) for writing the original OmniAuth strategy. This builds on his work.
+
 ## Installation
 
 Add this line to your application's Gemfile:
 
     gem 'omniauth-constantcontact2'
@@ -33,9 +35,17 @@
 ```ruby
 Rails.application.config.middleware.use OmniAuth::Builder do
   provider :constantcontact, ENV['CC_KEY'], ENV['CC_SECRET']
 end
 ```
+
+** Ensure that you have provided the correct Redirect URI in Constant Contact when you generated the Key.
+You are likely to see an error stating "invalid redirect" if the Request URI does not match the one from your environment.
+
+In development for example the Redirect URI is
+
+    http://localhost:3000/auth/constantcontact/callback
+
 
 You will have to put in your consumer key and secret, which you can find at http://community.constantcontact.com/t5/Documentation/API-Keys/ba-p/25015
 
 For additional information, refer to the [OmniAuth wiki](https://github.com/intridea/omniauth/wiki).
 