README.md in mautic-0.1.3 vs README.md in mautic-0.1.4

@@ -4,9 +4,16 @@
 *Rails 4 compatible*
 ## Usage
 ### Gem provides API connection to your Mautic(s)
   1. Create mautic connection
   2. Authorize it
+      
+      In mautic you need add API oauth2 login.
+      For URI callback allow:
+      ```
+      http://localhost:3000/mautic/connections/:ID/oauth2
+      ```
+      ID = is your Mautic::Connection ID
   
    Find connection which you want to use:
   ```ruby
   m = Mautic::Connection.last
   ```