more to read

Christoph Singer · Christoph Singer · commit e022780cdbda · 2015-11-05T22:44:58.000+01:00
diff --git a/README.md b/README.md
@@ -14,6 +14,7 @@ Currently it has the following features:
   - Compress embedded Javascript using [mrclay/jsmin-php](https://packagist.org/packages/mrclay/jsmin-php)
   - Compress embedded CSS using [tubalmartin/cssmin](https://packagist.org/packages/tubalmartin/cssmin)
   - Remove some attributes when their value is empty (by default "style" and "class" attributes)
+  - Remove comments, except those matching some given regular expressions (by default, IE conditional comments are kept)
 
 Installation
 ------------
@@ -34,4 +35,16 @@ $output = $pm
                     // or an \SplFileInfo pointing to an HTML document
     ->minify()
     ->saveHtml();
+```
+
+Attention: Because the formatting is done directly on the DOM tree, a DOMDocument given to the `load()` method
+will be modified:
+
+```php
+$dom_document = new \DOMDocument('1.0', 'UTF-8');
+$dom_document->loadHTML('<html>...some html code...</html>');
+
+$pm->load($dom_document)->minify();
+
+echo $dom_document->saveHTML(); // Will output the minified, not the original, document
 ```
