diff --git a/lib/message.js b/lib/message.js
index 149105b..f323f3b 100644
--- a/lib/message.js
+++ b/lib/message.js
@@ -1,3 +1,8 @@
+/**
+ * `Message` constructor.
+ *
+ * @api protected
+ */
 function Message(queue, message, headers, deliveryInfo) {
   // Crane uses slash ('/') separators rather than period ('.')
   this.topic = deliveryInfo.routingKey.replace(/\./g, '/');
@@ -6,12 +11,24 @@ function Message(queue, message, headers, deliveryInfo) {
   // TODO: only set body if it has been parsed, otherwise set `data`
   this.body = message;
   
-  this._amqp = { queue: queue };
+  this._q = queue;
 }
 
+/**
+ * Acknowledge message.
+ *
+ * Examples:
+ *
+ *     msg.ack();
+ *
+ * @api public
+ */
 Message.prototype.ack = function() {
-  this._amqp.queue.shift();
+  this._q.shift();
 }
 
 
+/**
+ * Expose `Message`.
+ */
 module.exports = Message;