diff --git a/TODO b/TODO
index 75efac6..bcbbcbe 100644
--- a/TODO
+++ b/TODO
@@ -120,3 +120,14 @@ Description: A handler that can be registered with an urllib.request
              OpenerDirector to open importlib.resources package files.
 
 ---
+
+ID: 7
+Type: feature
+Title: setup advanced testing environment
+Status: open
+Priority: high
+Created: 2025-06-20
+Description: copy the testing environment setup from
+             byteb4rb1e.sphinxcontrib.ext
+
+---