diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 00000000..62409b3b
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,18 @@
+<!--?xml version="1.0" encoding="UTF-8"?-->
+
+<phpunit colors="true" bootstrap="vendor/autoload.php">
+  <testsuites>
+    <testsuite name="composer-patches">
+        <directory>./tests/</directory>
+    </testsuite>
+  </testsuites>
+  <!-- Filter for coverage reports. -->
+  <filter>
+    <whitelist>
+      <directory>src/</directory>
+    </whitelist>
+    <blacklist>
+      <directory>vendor/</directory>
+    </blacklist>
+  </filter>
+</phpunit>
diff --git a/src/PatchEvent.php b/src/PatchEvent.php
new file mode 100644
index 00000000..31d36f89
--- /dev/null
+++ b/src/PatchEvent.php
@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * @file
+ * Dispatch events when patches are applied.
+ */
+
+namespace cweagans\Composer;
+
+use Composer\EventDispatcher\Event;
+use Composer\Package\PackageInterface;
+
+class PatchEvent extends Event {
+
+ /**
+  * @var PackageInterface $package
+  */
+ protected $package;
+ /**
+  * @var string $url
+  */
+ protected $url;
+ /**
+  * @var string $description
+  */
+ protected $description;
+
+  /**
+   * Constructs a PatchEvent object.
+   *
+   * @param string $eventName
+   * @param PackageInterface $package
+   * @param string $url
+   * @param string $description
+   */
+  public function __construct($eventName, PackageInterface $package, $url, $description) {
+    parent::__construct($eventName);
+    $this->package = $package;
+    $this->url = $url;
+    $this->description = $description;
+  }
+
+  /**
+   * Returns the package that is patched.
+   *
+   * @return PackageInterface
+   */
+  public function getPackage() {
+    return $this->package;
+  }
+
+  /**
+   * Returns the url of the patch.
+   *
+   * @return string
+   */
+  public function getUrl() {
+    return $this->url;
+  }
+
+  /**
+   * Returns the description of the patch.
+   *
+   * @return string
+   */
+  public function getDescription() {
+    return $this->description;
+  }
+
+}
diff --git a/src/PatchEvents.php b/src/PatchEvents.php
new file mode 100644
index 00000000..ecee9476
--- /dev/null
+++ b/src/PatchEvents.php
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @file
+ * Dispatch events when patches are applied.
+ */
+
+namespace cweagans\Composer;
+
+class PatchEvents {
+
+  /**
+   * The PRE_PATCH_APPLY event occurs before a patch is applied.
+   *
+   * The event listener method receives a cweagans\Composer\PatchEvent instance.
+   *
+   * @var string
+   */
+  const PRE_PATCH_APPLY = 'pre-patch-apply';
+
+  /**
+   * The POST_PATCH_APPLY event occurs after a patch is applied.
+   *
+   * The event listener method receives a cweagans\Composer\PatchEvent instance.
+   *
+   * @var string
+   */
+  const POST_PATCH_APPLY = 'post-patch-apply';
+
+}
diff --git a/src/Patches.php b/src/Patches.php
index b280175f..8cbaef0e 100644
--- a/src/Patches.php
+++ b/src/Patches.php
@@ -35,6 +35,10 @@ class Patches implements PluginInterface, EventSubscriberInterface {
    * @var IOInterface $io
    */
   protected $io;
+  /**
+   * @var EventDispatcher $eventDispatcher
+   */
+  protected $eventDispatcher;
   /**
    * @var ProcessExecutor $executor
    */
@@ -53,6 +57,7 @@ class Patches implements PluginInterface, EventSubscriberInterface {
   public function activate(Composer $composer, IOInterface $io) {
     $this->composer = $composer;
     $this->io = $io;
+    $this->eventDispatcher = $composer->getEventDispatcher();
     $this->executor = new ProcessExecutor($this->io);
     $this->patches = array();
   }
@@ -226,7 +231,9 @@ public function postInstall(PackageEvent $event) {
     foreach ($this->patches[$package_name] as $description => $url) {
       $this->io->write('    <info>' . $url . '</info> (<comment>' . $description. '</comment>)');
       try {
+        $this->eventDispatcher->dispatch(NULL, new PatchEvent(PatchEvents::PRE_PATCH_APPLY, $package, $url, $description));
         $this->getAndApplyPatch($downloader, $install_path, $url);
+        $this->eventDispatcher->dispatch(NULL, new PatchEvent(PatchEvents::POST_PATCH_APPLY, $package, $url, $description));
         $extra['patches_applied'][$description] = $url;
       }
       catch (\Exception $e) {
diff --git a/tests/PatchEventTest.php b/tests/PatchEventTest.php
new file mode 100644
index 00000000..0f6adb7a
--- /dev/null
+++ b/tests/PatchEventTest.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * @file
+ * Tests event dispatching.
+ */
+
+namespace cweagans\Composer\Tests;
+
+use cweagans\Composer\PatchEvent;
+use cweagans\Composer\PatchEvents;
+use Composer\Package\PackageInterface;
+
+class PatchEventTest extends \PHPUnit_Framework_TestCase {
+
+  /**
+   * Tests all the getters.
+   *
+   * @dataProvider patchEventDataProvider
+   */
+  public function testGetters($event_name, PackageInterface $package, $url, $description) {
+    $patch_event = new PatchEvent($event_name, $package, $url, $description);
+    $this->assertEquals($event_name, $patch_event->getName());
+    $this->assertEquals($package, $patch_event->getPackage());
+    $this->assertEquals($url, $patch_event->getUrl());
+    $this->assertEquals($description, $patch_event->getDescription());
+  }
+
+  public function patchEventDataProvider() {
+    $prophecy = $this->prophesize('Composer\Package\PackageInterface');
+    $package = $prophecy->reveal();
+
+    return array(
+      array(PatchEvents::PRE_PATCH_APPLY, $package, 'https://www.drupal.org', 'A test patch'),
+      array(PatchEvents::POST_PATCH_APPLY, $package, 'https://www.drupal.org', 'A test patch'),
+    );
+  }
+
+}