diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 2d95fea..0cf8b09 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -24,6 +24,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: 'true'
       - name: Setup Pages
         uses: actions/configure-pages@v5
       - name: Install Doxygen