diff --git a/README.md b/README.md
index 431a3b0..e44e4d5 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ grunt.initConfig({
     your_target: {
       options: {
         //You typically would only specify one option per target but they may be combined
-        read: {selector:'link',attribute:'href',writeto:'myCssRefs',isPath:true},
+        read: {selector:'link',attribute:'href',writeto:'myCssRefs',isPath:true, filter:function(val){return val;}},
         remove: '#removeMe',
         update: {selector:'html',attribute:'appmode',value:'production'},
         append: {selector:'body',html:'<div id="appended">Im being appended</div>'}, 
@@ -55,7 +55,7 @@ grunt.initConfig({
 Note: each option (except callback) requires a `selector`.  This can be any valid JQuery selector.
 
 #### options.read 
-Extract the value of a given attribute from the set of matched elements then set the values into `dom_munger.data.{writeto}`.  A typical use-case is to grab the script references from your html file and pass that to `concat`,`uglify`, or `cssmin`.
+Extract the value of a given attribute from the set of matched elements then set the values into `dom_munger.data.{writeto}`. If you pass a `filter` function it will be called against each attribute retrieved. A typical use-case is to grab the script references from your html file and pass that to `concat`,`uglify`, or `cssmin`.
 
 ```js
 grunt.initConfig({
diff --git a/tasks/dom_munger.js b/tasks/dom_munger.js
index c48313e..8af1b0e 100644
--- a/tasks/dom_munger.js
+++ b/tasks/dom_munger.js
@@ -58,8 +58,11 @@ module.exports = function(grunt) {
               if (!options.read.selector || !options.read.attribute || !options.read.writeto){
                 grunt.log.error('Read config missing selector, attribute, and/or writeto options');
               } else {
+                if(!options.read.filter) {
+                  options.read.filter = function(val) {return val;};
+                }
                 var vals = $.map($(options.read.selector),function(elem){
-                  return $(elem).attr(options.read.attribute);
+                  return options.read.filter($(elem).attr(options.read.attribute));
                 });
 
                 if (options.read.isPath){