diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index 8061c58..cfa0a2f 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -20,6 +20,8 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       - uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
       - uses: ammaraskar/sphinx-action@0.4
         with:
           docs-folder: "doc/"
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