diff --git a/lib/class_builder.js b/lib/class_builder.js
index e1757f2..fc8f7c8 100644
--- a/lib/class_builder.js
+++ b/lib/class_builder.js
@@ -322,9 +322,9 @@ function createConcreteCtor( cname, members )
         }
 
         // generate and store unique instance id
-        attachInstanceId( this, ++instance_id, ClassInstance );
+        attachInstanceId( this, ++instance_id );
 
-        initInstance( instance_id, this );
+        initInstance( this );
         this.__initProps();
 
         // If we're extending, we don't actually want to invoke any class
@@ -771,10 +771,10 @@ function attachInstanceId( instance, iid )
 /**
  * Initializes class instance
  *
- * This process will create the instance visibility object containing private
- * and protected members. The class instance is part of the prototype chain.
- * This will be passed to all methods when invoked, permitting them to access
- * the private and protected members while keeping them encapsulated.
+ * This process will create the instance visibility object that will contain
+ * private and protected members. The class instance is part of the prototype
+ * chain.  This will be passed to all methods when invoked, permitting them to
+ * access the private and protected members while keeping them encapsulated.
  *
  * For each instance, there is always a base. The base will contain a proxy to
  * the public members on the instance itself. The base will also contain all
@@ -791,12 +791,11 @@ function attachInstanceId( instance, iid )
  * The resulting structure looks something like this:
  *   class_instance = { iid: { cid: {} } }
  *
- * @param  {number}  iid       instance id
  * @param  {Object}  instance  instance to initialize
  *
  * @return  {undefined}
  */
-function initInstance( iid, instance )
+function initInstance( instance )
 {
     var prot = function() {};
     prot.prototype = instance;