diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ab0504d28..90e1b9773 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -94,6 +94,11 @@ python3 -mvenv .venv
 .venv/bin/python     -m sphinx -T -E -b html -d _build/doctrees -D language=en docs _build/html
 ```
 
+Python versions known to build documentation:
+- 3.8
+- 3.9
+- 3.10
+
 Then open up `_build/html/index.html` in your favorite browser.
 
 ### Pull Requests documentation builds