diff --git a/TODO b/TODO
index 9b0c012..6cf48ae 100644
--- a/TODO
+++ b/TODO
@@ -207,3 +207,15 @@ Description: with a proper content-type of the PkgHandler addinfourl object, a
              consumer can determine whether the file is compressed or not.
 
 ---
+
+ID: 15
+Type: bugfix
+Title: modularize module containers
+Status: open
+Priority: high
+Created: 2025-06-28
+Description: Even though importlib can find submodules through traversing paths
+             instead of relying on __init__.py for every ancestor module, this
+             is not supported by some modules like sphinx.ext.autosummary
+
+---