diff --git a/README.md b/README.md
index 3d8ae99..10a8bf7 100644
--- a/README.md
+++ b/README.md
@@ -35,34 +35,45 @@ This package comes with 2 directives:
 ## Editor
 
 ```html
-<pagedown-editor content="data.content"></pagedown-editor>
+<pagedown-editor ng-model="data.content"></pagedown-editor>
 ```
 
 Options:
 
-#### content
+#### ng-model
 
-1. An expression. 
+1. An expression.
 1. *Expression*: Mandatory
-1. Example: `<pagedown-editor content="data.content"></pagedown-editor>`
-1. Example: `<pagedown-editor content="'**some** _markdown_ text'"></pagedown-editor>`
+1. Example: `<pagedown-editor ng-model="data.content"></pagedown-editor>`
+1. Example: `<pagedown-editor ng-model="'**some** _markdown_ text'"></pagedown-editor>`
+
+#### ng-change
+
+1. An expression.
+1. *Expression*: Optional
+1. Example: `<pagedown-editor ng-change="log()"></pagedown-editor>`
+
+#### $dirty
+
+- `<pagedown-editor ng-model="data.content" name="mdInput"></pagedown-editor>`
+ - ``<dd ng-bind="myForm.mdInput.$dirty"></dd>``
 
 #### show-preview
 
-1. Should a live preview be displayed. 
+1. Should a live preview be displayed.
 1. *Boolean*: Default to true
 
 #### help
 
-1. An expression to invoke upon clicking the help (?) button. 
+1. An expression to invoke upon clicking the help (?) button.
 1. *Expression*: Default to open http://daringfireball.net/projects/markdown/syntax in new window
-1. Example: `<pagedown-editor content="data.content" help="showSomeHelp()"></pagedown-editor>`
+1. Example: `<pagedown-editor ng-model="data.content" help="showSomeHelp()"></pagedown-editor>`
 
 #### insert-image
 
-1. An expression to invoke upon clicking the "Insert Image" button. 
+1. An expression to invoke upon clicking the "Insert Image" button.
 1. *Expression*: Default to `noop`
-1. Example: `<pagedown-editor content="data.content" insert-image="promptImageUrl()"></pagedown-editor>`
+1. Example: `<pagedown-editor ng-model="data.content" insert-image="promptImageUrl()"></pagedown-editor>`
   1. The parent scope function `promptImageUrl` must return either:
     - A string of image URL.
     - A promise resolved with a string of image URL.
@@ -71,15 +82,15 @@ Options:
 
 1. An expression.
 1. *Expression*: Default to empty string
-1. Example: `<pagedown-editor content="data.content" placeholder="{{data.placeholder}} or anything"></pagedown-editor>` 
+1. Example: `<pagedown-editor ng-model="data.content" placeholder="{{data.placeholder}} or anything"></pagedown-editor>`
 
 #### editor-class
 
 1. An expression to use as [ngClass](https://docs.angularjs.org/api/ng/directive/ngClass).
 1. *Expression*: Default to `wmd-input`
-1. Example: `<pagedown-editor content="data.content" editorClass="{'a-class': true}"></pagedown-editor>`
-1. Example: `<pagedown-editor content="data.content" editorClass="'a-class another-class'"></pagedown-editor>`
-1. Example: `<pagedown-editor content="data.content" editorClass="aScopeVariable"></pagedown-editor>`
+1. Example: `<pagedown-editor ng-model="data.content" editorClass="{'a-class': true}"></pagedown-editor>`
+1. Example: `<pagedown-editor ng-model="data.content" editorClass="'a-class another-class'"></pagedown-editor>`
+1. Example: `<pagedown-editor ng-model="data.content" editorClass="aScopeVariable"></pagedown-editor>`
 
 #### editor-rows
 
diff --git a/angular-pagedown.js b/angular-pagedown.js
index 9eb962e..6b52ffd 100644
--- a/angular-pagedown.js
+++ b/angular-pagedown.js
@@ -33,10 +33,7 @@ angular.module("ui.pagedown", [])
             },
             link: function (scope, element, attrs, ngModel) {
 
-                scope.changed = function () {
-                    ngModel.$setDirty();
-                    scope.$parent.$eval(attrs.ngChange);
-                };
+
 
 
                 var editorUniqueId;
@@ -84,11 +81,23 @@ angular.module("ui.pagedown", [])
 
                 editorElement.val(scope.ngModel);
 
+
+                scope.changed = function () {
+                    var v = editorElement.val();
+                    ngModel.$setViewValue(v);
+                };
+
                 converter.hooks.chain("postConversion", function (text) {
-                    ngModel.$setViewValue(editorElement.val());
+
+                    var v = editorElement.val();
+                    if (scope.ngModel !== v) {
+                        ngModel.$setViewValue(v);
+                    }
+
 
                     // update
                     scope.previewContent = text;
+
                     return text;
                 });