diff --git a/.github/common_environment.yml b/.github/common_environment.yml
index 9ed085d05..10ce730b9 100644
--- a/.github/common_environment.yml
+++ b/.github/common_environment.yml
@@ -5,4 +5,4 @@
   SLACK_ICON:            https://raw.githubusercontent.com/DFE-Digital/get-into-teaching-api/master/.github/image.png?size=48
   SLACK_USERNAME:        GiT Workflows
   SLACK_FOOTER:          Get Into Teaching API Service
-  Sentry__Dsn:           ""
+  Sentry__Dsn:           ""       # NB the Sentry__Dsn variable is case-sensitive