diff --git a/doc/languages-frameworks/python.section.md b/doc/languages-frameworks/python.section.md
index fa7f3eddf72c..4ca177bcdd26 100644
--- a/doc/languages-frameworks/python.section.md
+++ b/doc/languages-frameworks/python.section.md
@@ -2014,6 +2014,10 @@ example of such a situation is when `py.test` is used.
 
 * Tests that attempt to access `$HOME` can be fixed by using the following
   work-around before running tests (e.g. `preCheck`): `export HOME=$(mktemp -d)`
+* Compiling with Cython causes tests to fail with a `ModuleNotLoadedError`.
+  This can be fixed with two changes in the derivation: 1) replacing `pytest` with
+  `pytestCheckHook` and 2) adding a `preCheck` containing `cd $out` to run
+  tests within the built output.
 
 ## Contributing {#contributing}