diff --git a/_posts/docs/2010-12-03-options.mdown b/_posts/docs/2010-12-03-options.mdown
index 294eb64..495e488 100644
--- a/_posts/docs/2010-12-03-options.mdown
+++ b/_posts/docs/2010-12-03-options.mdown
@@ -234,11 +234,13 @@ Similiar to a callback, `onLayout` is a function that will be triggered after ev
 {% highlight javascript %}
 
 $('#container').isotope({
-  onLayout: function( $elems ) {
+  onLayout: function( $elems, instance ) {
     // `this` refers to jQuery object of the container element
     console.log( this.height() );
     // callback provides jQuery object of laid-out item elements
     $elems.css({ background: 'blue' });
+    // instance is the Isotope instance
+    console.log( instance.$filteredAtoms.length );
   }
 });
 
diff --git a/_posts/tests/2012-02-07-onlayout.html b/_posts/tests/2012-02-07-onlayout.html
index b27ba15..05e891e 100644
--- a/_posts/tests/2012-02-07-onlayout.html
+++ b/_posts/tests/2012-02-07-onlayout.html
@@ -5,7 +5,7 @@ category: tests
 ---
 
 <section id="copy">
-  <p>Tests that onLayout callback is triggering properly, after animation/transition has completed.</p>
+  <p>Tests that <a href="../docs/options.html#onlayout">onLayout callback</a> is triggering properly, after animation/transition has completed.</p>
 
 </section>
 
@@ -48,10 +48,11 @@ category: tests
     var colors = ['red', 'green', 'blue', 'yellow', 'purple', 'orange', 'white'],
         colorI = 0;
 
-    function changeBGColor() {
+    function changeBGColor( $elems, instance ) {
       var color = colors[ colorI % colors.length ];
       $container.css({ background: color })
       colorI++;
+      // console.log( $elems.length, instance.$filteredAtoms.length );
     }
 
     function lmk() {
diff --git a/jquery.isotope.js b/jquery.isotope.js
index c6e1b7d..b7f395b 100644
--- a/jquery.isotope.js
+++ b/jquery.isotope.js
@@ -1,5 +1,5 @@
 /**
- * Isotope v1.5.17
+ * Isotope v1.5.18
  * An exquisite jQuery plugin for magical layouts
  * http://isotope.metafizzy.co
  *
@@ -664,7 +664,7 @@
           for (var i=0, len = callbacks.length; i < len; i++) {
             hollaback = callbacks[i];
             if ( typeof hollaback === 'function' ) {
-              hollaback.call( instance.element, $elems );
+              hollaback.call( instance.element, $elems, instance );
             }
           }
           isCallbackTriggered = true;
diff --git a/jquery.isotope.min.js b/jquery.isotope.min.js
index d1cf091..9cad86e 100644
--- a/jquery.isotope.min.js
+++ b/jquery.isotope.min.js
@@ -1,5 +1,5 @@
 /**
- * Isotope v1.5.17
+ * Isotope v1.5.18
  * An exquisite jQuery plugin for magical layouts
  * http://isotope.metafizzy.co
  *
@@ -8,4 +8,4 @@
  *
  * Copyright 2012 David DeSandro / Metafizzy
  */
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