diff --git a/.codespellrc b/.codespellrc
index 97f3aa407..b5b963a35 100644
--- a/.codespellrc
+++ b/.codespellrc
@@ -1,5 +1,5 @@
 [codespell]
-skip = .git,*.ipynb,*.bib,*.ps,*.js,*.pdf
+skip = .git,*.bib,*.ps,*.js,*.pdf
 ignore-words = .codespell-ignore-words
 
 
diff --git a/.github/workflows/codespell.yml b/.github/workflows/codespell.yml
index 737acff1b..a500eeb29 100644
--- a/.github/workflows/codespell.yml
+++ b/.github/workflows/codespell.yml
@@ -26,6 +26,9 @@ jobs:
       - name: Install dependencies
         run: pip install -r ./requirements.txt
 
+      - name: Preprocess notebooks
+        run: for i in $(find . -name "*.ipynb"); do jupyter nbconvert --clear-output --inplace $i; done
+
       - name: Run codespell
         run: |
           codespell
diff --git a/docs/source/adding_a_problem_jupyter.ipynb b/docs/source/adding_a_problem_jupyter.ipynb
index d8e116739..2fd829302 100644
--- a/docs/source/adding_a_problem_jupyter.ipynb
+++ b/docs/source/adding_a_problem_jupyter.ipynb
@@ -114,7 +114,7 @@
    "id": "6f682998-c452-4fdf-87dc-bac340e9e9df",
    "metadata": {},
    "source": [
-    "It often works best if you start with an existing problem.  We can inspect the source of one of the build-in problems easily:"
+    "It often works best if you start with an existing problem.  We can inspect the source of one of the built-in problems easily:"
    ]
   },
   {
diff --git a/docs/source/rt_average.ipynb b/docs/source/rt_average.ipynb
index 14fdaa201..07be20e0e 100644
--- a/docs/source/rt_average.ipynb
+++ b/docs/source/rt_average.ipynb
@@ -13,7 +13,7 @@
    "id": "6395d3eb-9572-454b-823a-b5c2f8c4267d",
    "metadata": {},
    "source": [
-    "Here we show how to do a lateral / horizonal average of the compressible Rayleigh-Taylor\n",
+    "Here we show how to do a lateral / horizontal average of the compressible Rayleigh-Taylor\n",
     "simulation to see what the average vertical profile of the mixing looks like."
    ]
   },