Update for README to contain endpoint

README.md.patch

diff --git a/README.md b/README.md
index b971bc8..0c1a433 100644
--- a/README.md
+++ b/README.md
@@ -40,11 +40,13 @@ $schemes = [
         'StorageClass' => 'REDUCED_REDUNDANCY',
       ],
 
-      'protocol' => 'https',             // Will be autodetected based on the current request.
+      'protocol' => 'https',                      // Will be autodetected based on the current request.
 
-      'prefix' => 'an/optional/prefix',  // Directory prefix for all uploaded/viewed files.
+      'prefix' => 'an/optional/prefix',           // Directory prefix for all uploaded/viewed files.
 
-      'cname' => 'static.example.com',   // A cname that resolves to your bucket. Used for URL generation.
+      'cname' => 'static.example.com',            // A cname that resolves to your bucket. Used for URL generation.
+
+      // 'endpoint' => 'https://api.example.com', // An alternative API endpoint for 3rd party S3 providers
     ],
 
     'cache' => TRUE, // Creates a metadata cache to speed up lookups.