diff --git a/src/OAuth2/AuthServer.php b/src/OAuth2/AuthServer.php
index a4ce3cbf..683255ec 100644
--- a/src/OAuth2/AuthServer.php
+++ b/src/OAuth2/AuthServer.php
@@ -8,6 +8,14 @@ use OAuth2\Storage\ScopeInterface;
 
 class AuthServer
 {
+    /**
+     * The delimeter between scopes specified in the scope query string parameter
+     *
+     * The OAuth 2 specification states it should be a space but that is stupid
+     * and everyone excepted Google use a comma instead.
+     *
+     * @var string
+     */
     protected $scopeDelimeter = ',';
 
     protected $expiresIn = 3600;