diff --git a/README.md b/README.md
index 3a1fbbc..a74d238 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ This is inspired by [node-jsontoxml](https://github.com/soldair/node-jsontoxml),
 ### Features
 * supports a variety of inputs: objects, arrays, strings, 
 * tabbed output (optional)
-* custom filters (& -> &, etc) (optional)
+* custom filters (<code>&</code> -> <code>&amp;</code>, etc) (optional)
 
 ### Installation
 * npm install jstoxml
diff --git a/package.json b/package.json
index 567ade4..7b91e99 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "jstoxml",
-	"version": "0.2.1",
+	"version": "0.2.2",
 	"description": "Convert JSON to XML (for RSS, Podcasts, etc.)",
 	"homepage": "http://github.com/davidcalhoun/jstoxml",
 	"main": "./jstoxml.js",
diff --git a/test.js b/test.js
index f271a80..e16aa33 100644
--- a/test.js
+++ b/test.js
@@ -535,14 +535,30 @@ var jstoxml = require('./jstoxml.js');
   });
 
   addTest({
-    name: 'bug4',
+    name: 'bug4a',
     input: function(){
       return jstoxml.toXML({
-        foo: 4
+        foo: 4,
+        bar: '&'
       });
     },
-    expectedOutput: '<foo>true</foo><bar></bar><foo2>false</foo2><ok>This is ok</ok><ok2>false</ok2><ok3>true</ok3>'
-  });  
+    expectedOutput: '<foo>4</foo><bar>&</bar>'
+  });
+
+  addTest({
+    name: 'bug4b',
+    input: function(){
+      return jstoxml.toXML({
+        foo: '&'
+      },
+      {
+        filter: {
+          '&': '&amp;'
+        }
+      });
+    },
+    expectedOutput: '<foo>&amp;</foo>'
+  });   
   
   runTests();
   showReport();