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diff --git a/TODO.md b/TODO.md
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--- a/TODO.md
+++ b/TODO.md
@@ -56,6 +56,7 @@
         Possible implementations:
         https://stackoverflow.com/questions/40735727/create-index-of-definitions-theorems-at-end-of-bookdown-book?rq=4
 * [ ] Misc:
+  * [ ] Spell checking as a `Makefile` target.
   * [ ] Suport for a `BASE_URL` environment variable?
         It would be applied as a template variable in `%%base_url%%` placeholers,
         allowing the compile material to have links among themselves.