diff --git a/pyproject.toml b/pyproject.toml
index 84d4907a4fc8..b2bb4cfc2465 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -152,6 +152,7 @@ portalocker = "^2.7.0"
 structlog = "^23.1.0"
 structlog-sentry = "^2.0.2"
 # pin dnspython to avoid dependency incompatibility
+# in order to fix https://rasahq.atlassian.net/browse/ATO-1419
 dnspython = "2.3.0"
 
 [[tool.poetry.dependencies.tensorflow-io-gcs-filesystem]]