diff --git a/composer.json b/composer.json
index a9804a3..e269f0f 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
             "email": "vincent@girol.fr"
         }
     ],
-    "minimum-stability": "dev",
+    "minimum-stability": "stable",
     "autoload": {
         "psr-4": {
             "VGirol\\JsonApiAssert\\": "src/"
diff --git a/src/Factory/CollectionFactory.php b/src/Factory/CollectionFactory.php
index cd79121..54f76b2 100644
--- a/src/Factory/CollectionFactory.php
+++ b/src/Factory/CollectionFactory.php
@@ -15,7 +15,7 @@ class CollectionFactory extends BaseFactory
     /**
      * Undocumented function
      *
-     * @param array<ResourceObjectFactory>|array<ResourceObjectFactory> $collection
+     * @param array<ResourceIdentifierFactory>|array<ResourceObjectFactory> $collection
      * @return static
      */
     public function setCollection($collection)
@@ -38,9 +38,17 @@ function ($resource) {
         );
     }
 
-    public function each($callback): void
+    /**
+     * Undocumented function
+     *
+     * @param callable $callback
+     * @return static
+     */
+    public function each($callback)
     {
         array_walk($this->array, $callback);
+
+        return $this;
     }
 
     public function map($callback): array
diff --git a/src/Factory/HelperFactory.php b/src/Factory/HelperFactory.php
index 59f6583..4441dc3 100644
--- a/src/Factory/HelperFactory.php
+++ b/src/Factory/HelperFactory.php
@@ -6,6 +6,11 @@
 class HelperFactory
 {
     public static function getAliases(): array
+    {
+        return [];
+    }
+
+    private static function getDefaultAliases(): array
     {
         return [
             'collection' => CollectionFactory::class,
@@ -18,7 +23,7 @@ public static function getAliases(): array
 
     public static function getClassName(string $key): string
     {
-        $aliases = static::getAliases();
+        $aliases = array_merge(static::getDefaultAliases(), static::getAliases());
         if (!isset($aliases[$key])) {
             throw new \Exception(
                 sprintf('Inexistant key "%s".', $key)