diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
new file mode 100644
index 00000000..37d3ae3d
--- /dev/null
+++ b/.github/workflows/documentation.yml
@@ -0,0 +1,47 @@
+name: "Documentation"
+
+on:
+  pull_request:
+    branches:
+      - "*.x"
+    paths:
+      - .github/workflows/documentation.yml
+      - docs/**
+  push:
+    branches:
+      - "*.x"
+    paths:
+      - .github/workflows/documentation.yml
+      - docs/**
+
+jobs:
+  validate-with-guides:
+    name: "Validate documentation with phpDocumentor/guides"
+    runs-on: "ubuntu-22.04"
+
+    steps:
+      - name: "Checkout code"
+        uses: "actions/checkout@v3"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "8.2"
+
+      - name: "Remove existing composer file"
+        run: "rm composer.json"
+
+      - name: "Require phpdocumentor/guides-cli"
+        run: "composer require --dev phpdocumentor/guides-cli dev-main@dev --no-update"
+
+      - name: "Configure minimum stability"
+        run: "composer config minimum-stability dev"
+
+      - name: "Install dependencies with Composer"
+        uses: "ramsey/composer-install@v2"
+        with:
+          dependency-versions: "highest"
+
+      - name: "Run guides-cli"
+        run: "vendor/bin/guides -vvv --no-progress --fail-on-log docs/en /tmp/test"
diff --git a/src/ArrayCollection.php b/src/ArrayCollection.php
index 2804fd76..59f26e48 100644
--- a/src/ArrayCollection.php
+++ b/src/ArrayCollection.php
@@ -429,6 +429,8 @@ public function partition(Closure $p)
     /**
      * Returns a string representation of this object.
      * {@inheritDoc}
+     *
+     * @return string
      */
     #[ReturnTypeWillChange]
     public function __toString()