diff --git a/lib/train.js b/lib/train.js
index <HASH>..<HASH> 100644
--- a/lib/train.js
+++ b/lib/train.js
@@ -145,6 +145,11 @@ exports.Train = ( function () {
 
     tproto.iterate = function ( fn, scope, cback ) {
         var me = this,
+            /*
+             * Note : size is fixed to the current queue size,
+             * then it is possible to add/push elements to the left/tail,
+             * without affecting/using these elements.
+             */
             size = me.size(),
             cnt = 0,
             scope = scope || me,
Added a comment for Train#iterate() in the code.
On branch master
Changes to be committed:
modified:   lib/train.js