diff --git a/tox.ini b/tox.ini
index b3308bf8..449f2718 100644
--- a/tox.ini
+++ b/tox.ini
@@ -70,6 +70,7 @@ deps =
 commands = pytest -vvs --tb native --show-capture=no --log-cli-level=INFO --asyncio-mode=auto {posargs} {toxinidir}/tests/
 
 # image defintions maintenance: container image patch, build, scan, and publish
+# See ./image-definitions/README.md for more details.
 [testenv:images-setup]
 whitelist_externals = bash
 passenv =