diff --git a/src/Event/PostManifestBuildEvent.php b/src/Event/PostManifestBuildEvent.php
new file mode 100644
index 0000000..e96dd56
--- /dev/null
+++ b/src/Event/PostManifestBuildEvent.php
@@ -0,0 +1,28 @@
+<?php
+
+
+namespace SpomkyLabs\PwaBundle\Event;
+
+use SpomkyLabs\PwaBundle\Dto\Manifest;
+use Symfony\Contracts\EventDispatcher\Event;
+
+/**
+ * Dispatched during the ManifestBuilder::create method, after the configuration is denormalized
+ */
+class PostManifestBuildEvent extends Event
+{
+    public function __construct(private Manifest $manifest)
+    {
+    }
+
+    public function setManifest(Manifest $manifest): void
+    {
+        $this->manifest = $manifest;
+    }
+
+    public function getManifest(): Manifest
+    {
+        return $this->manifest;
+    }
+}
+
diff --git a/src/Event/PreManifestBuildEvent.php b/src/Event/PreManifestBuildEvent.php
new file mode 100644
index 0000000..abdedb0
--- /dev/null
+++ b/src/Event/PreManifestBuildEvent.php
@@ -0,0 +1,26 @@
+<?php
+
+
+namespace SpomkyLabs\PwaBundle\Event;
+
+use Symfony\Contracts\EventDispatcher\Event;
+
+/**
+ * Dispatched during the ManifestBuilder::create method, before the configuration is denormalized
+ */
+class PreManifestBuildEvent extends Event
+{
+    public function __construct(private array $config)
+    {
+    }
+
+    public function setConfig(array $config): void
+    {
+        $this->config = $config;
+    }
+
+    public function getConfig(): array
+    {
+        return $this->config;
+    }
+}
diff --git a/src/Service/ManifestBuilder.php b/src/Service/ManifestBuilder.php
index f478471..aa86fa6 100644
--- a/src/Service/ManifestBuilder.php
+++ b/src/Service/ManifestBuilder.php
@@ -5,6 +5,9 @@
 namespace SpomkyLabs\PwaBundle\Service;
 
 use SpomkyLabs\PwaBundle\Dto\Manifest;
+use SpomkyLabs\PwaBundle\Event\PostManifestBuildEvent;
+use SpomkyLabs\PwaBundle\Event\PreManifestBuildEvent;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
 use function assert;
 
@@ -17,6 +20,7 @@ final class ManifestBuilder
      */
     public function __construct(
         private readonly DenormalizerInterface $denormalizer,
+        private readonly null|EventDispatcherInterface $dispatcher,
         private readonly array $config,
     ) {
     }
@@ -24,8 +28,10 @@ public function __construct(
     public function create(): Manifest
     {
         if ($this->manifest === null) {
+            $this->dispatcher->dispatch(new PreManifestBuildEvent($this->config));
             $result = $this->denormalizer->denormalize($this->config, Manifest::class);
             assert($result instanceof Manifest);
+            $this->dispatcher->dispatch(new PostManifestBuildEvent($this->manifest));
             $this->manifest = $result;
         }