diff --git a/tox.ini b/tox.ini
index e21dded..07d5eb9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,9 +7,12 @@ basepython = python3.8
 
 [testenv:unit]
 allowlist_externals =
-    touch
+    echo
     rm
+    touch
 commands =
+    echo "Canceling the test before completion creates __init__.py files \
+        which could cause undesired behaviours. Make sure to delete the __init__.py files manually."
     ; Check for Python 3.5 compatibility to ensure Xenial support
     mypy --ignore-missing-imports --python-version 3.5 {toxinidir}/lib/charms/layer/jenkins {posargs}
     mypy --ignore-missing-imports --python-version 3.5 {toxinidir}/reactive {posargs}