More explicit conment

Co-authored-by: Matt Graham <matthew.m.graham@gmail.com>

Author: samcunliffe

.github/workflows/test.yml

@@ -7,7 +7,10 @@ on:
       - "renovate/**"
   pull_request:
   schedule:
-    - cron: "0 11 2 1 *" # Run at 11 am on the 2nd January
+    # Run at 11 am on the 2nd January each year to make sure
+    # dates in package regression test data get updated
+    # See https://github.com/UCL-ARC/python-tooling/pull/597
+    - cron: "0 11 2 1 *" 
 
 jobs:
   test-template: