diff --git a/composer.json b/composer.json
index 21d4c6a..142cf29 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,9 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^9.6",
-        "squizlabs/php_codesniffer": "^3"
+        "squizlabs/php_codesniffer": "^3",
+        "silverstripe/standards": "^1",
+        "phpstan/extension-installer": "^1.3"
     },
     "conflict": {
         "silverstripe/auditor": "<2.2.1"
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
new file mode 100644
index 0000000..beb9de3
--- /dev/null
+++ b/phpstan.neon.dist
@@ -0,0 +1,3 @@
+parameters:
+  paths:
+    - src
diff --git a/src/Extensions/CarouselPageExtension.php b/src/Extensions/CarouselPageExtension.php
index 4b913ff..c7c0720 100644
--- a/src/Extensions/CarouselPageExtension.php
+++ b/src/Extensions/CarouselPageExtension.php
@@ -14,12 +14,13 @@
 use SilverStripe\Forms\GridField\GridFieldDeleteAction;
 use SilverStripe\Forms\GridField\GridFieldSortableHeader;
 use SilverStripe\ORM\DataList;
+use SilverStripe\ORM\HasManyList;
 use Symbiote\GridFieldExtensions\GridFieldOrderableRows;
 use SilverStripe\Forms\GridField\GridFieldVersionedState;
 use SilverStripe\Forms\LiteralField;
 
 /**
- * @method SilverStripe\ORM\HasManyList<CarouselItem> CarouselItems()
+ * @method HasManyList<CarouselItem> CarouselItems()
  *
  * @extends DataExtension<SiteTree>
  */