diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 53f2100d..5fc693b0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -41,4 +41,4 @@ jobs:
     - name: Test examples
       run: uv run --locked --with pillow --script doc/examples/run_all.py
     - name: Test documentation
-      run: uv run --locked -m sphinx doc/ _build/ -b doctest
+      run: uv run --locked -m sphinx doc/ _build/ -b doctest -W
diff --git a/.gitignore b/.gitignore
index e1b18dfa..2e816198 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,7 @@ build/
 dist/
 .eggs/
 sfs.egg-info/
+/doc/sfs.*.rst
+/doc/examples/*.gif
+/doc/examples/*.png
+.ipynb_checkpoints/