diff --git a/DEPLOYMENT-NOTES.rst b/DEPLOYMENT-NOTES.rst
index e48a8b524ebd3218fd3b96e8a182b25886449fb8..5f1b15e933e9c2e98c364bf5969350a494987f61 100644
--- a/DEPLOYMENT-NOTES.rst
+++ b/DEPLOYMENT-NOTES.rst
@@ -1,7 +1,7 @@
 Deployment notes
 ================
 
-- 2021-10-XX The secret in ``private-keys/grafana-slack-url`` needs to be changed to remove the ``SLACKURL=`` prefix.
+- 2021-10-12 The secret in ``private-keys/grafana-slack-url`` needs to be changed to remove the ``SLACKURL=`` prefix.
 
 - 2021-09-30 `Enable alerting <https://whetstone.privatestorage.io/privatestorage/PrivateStorageio/-/merge_requests/185>`_ needs a secret in ``private-keys/grafana-slack-url`` looking like the template in ``morph/grid/local/private-keys/grafana-slack-url`` and pointing to the secret API endpoint URL saved in `this 1Password entry <https://privatestorage.1password.com/vaults/7flqasy5hhhmlbtp5qozd3j4ga/allitems/cgznskz2oix2tyx5xyntwaos5i>`_ (or create a new secret URL at https://www.slack.com/apps/A0F7XDUAZ).