diff --git a/README.md b/README.md
index d2a156f..53eaba2 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,13 @@ You will also need the following path structure on your system
 - com_jedchecker - This repository
 - buildtools - Compojoom build tools (https://github.com/compojoom/buildtools)
 
+To execute the build, copy `com_jedchecker/builds/build.properties.txt` renaming it without the `.txt` suffix.
+
+Then in your command line navigate to the `builds` directory and run `phing`
+
+    cd com_jedchecker/builds/
+    phing
+
 ## Uploading your package
 After installing this extension in your Joomla! backend, you can use it by uploading a Joomla! extension-package using
 the upload-button. Once uploaded, the contents of the package (your files) will be checked against JED-rules.
diff --git a/source/administrator/components/com_jedchecker/script.php b/source/administrator/components/com_jedchecker/script.php
index 68833ec..bfbd73c 100644
--- a/source/administrator/components/com_jedchecker/script.php
+++ b/source/administrator/components/com_jedchecker/script.php
@@ -23,11 +23,59 @@ class com_jedcheckerInstallerScript
         }
     }
 
+    /**
+     * Update cleans out any old rules.
+     *
+     * @param   JInstallerComponent  $parent  Is the class calling this method.
+     *
+     * @return  bool|null  If this returns false, Joomla will abort the update and undo everything already done.
+     */
+    public function update($parent)
+    {
+        $this->loadLanguage();
+
+        // Doing it this way in case there are other old rules to be deleted
+        $oldRules = array('htmlindexes');
+
+        foreach ($oldRules as $rule)
+        {
+            $rulePhpFile = JPATH_ADMINISTRATOR . '/components/' . $this->extension . '/libraries/rules/' . $rule . '.php';
+            $ruleIniFile = JPATH_ADMINISTRATOR . '/components/' . $this->extension . '/libraries/rules/' . $rule . '.ini';
+
+            // Remove the rule's php file
+            if(file_exists($rulePhpFile))
+            {
+                if(JFile::delete($rulePhpFile))
+                {
+                    $msg = JText::sprintf('COM_JEDCHECKER_OLD_RULE_X_PHP_FILE_REMOVED', $rule);
+                }
+                else
+                {
+                    $msg = JText::sprintf('COM_JEDCHECKER_OLD_RULE_X_PHP_FILE_NOT_REMOVED', $rule);
+                }
+                echo "<p>$msg</p>";
+            }
+
+            // Remove the rule's ini file
+            if(file_exists($ruleIniFile))
+            {
+                if(JFile::delete($ruleIniFile))
+                {
+                    $msg = JText::sprintf('COM_JEDCHECKER_OLD_RULE_X_INI_FILE_REMOVED', $rule);
+                }
+                else
+                {
+                    $msg = JText::sprintf('COM_JEDCHECKER_OLD_RULE_X_INI_FILE_NOT_REMOVED', $rule);
+                }
+                echo "<p>$msg</p>";
+            }
+        }
+    }
 
     public function loadLanguage()
     {
         $extension = $this->extension;
-        $jlang =& JFactory::getLanguage();
+        $jlang = JFactory::getLanguage();
         $path = $this->parent->getParent()->getPath('source') . '/administrator';
         $jlang->load($extension, $path, 'en-GB', true);
         $jlang->load($extension, $path, $jlang->getDefault(), true);
diff --git a/source/administrator/language/en-GB/en-GB.com_jedchecker.ini b/source/administrator/language/en-GB/en-GB.com_jedchecker.ini
index 66d3c65..ba58e3e 100644
--- a/source/administrator/language/en-GB/en-GB.com_jedchecker.ini
+++ b/source/administrator/language/en-GB/en-GB.com_jedchecker.ini
@@ -44,4 +44,8 @@ COM_JEDCHECKER_RULE_PH1_DESC="A notice is required on each PHP file stating that
 COM_JEDCHECKER_ERROR_GPL_NOT_FOUND="GPL or compatible license was not found"
 COM_JEDCHECKER_PH1_LICENSE_FOUND="GPL license was found"
 COM_JEDCHECKER_GPL_COMPATIBLE_LICENSE_WAS_FOUND="GPL compatible license was found"
-COM_JEDCHECKER_WARNING="Warning"
\ No newline at end of file
+COM_JEDCHECKER_WARNING="Warning"
+COM_JEDCHECKER_OLD_RULE_X_INI_FILE_NOT_REMOVED="'ini' file for '%s' rule could not be removed, manual removal recommended."
+COM_JEDCHECKER_OLD_RULE_X_PHP_FILE_NOT_REMOVED="PHP file for '%s' rule could not be removed, manual removal recommended."
+COM_JEDCHECKER_OLD_RULE_X_PHP_FILE_REMOVED="Removed PHP file for '%s' rule."
+COM_JEDCHECKER_OLD_RULE_X_INI_FILE_REMOVED="Removed 'ini' file for '%s' rule."
\ No newline at end of file