diff --git a/lib/util/template/index.ts b/lib/util/template/index.ts
index 5c3e1261e29a73..db40eabae6088d 100644
--- a/lib/util/template/index.ts
+++ b/lib/util/template/index.ts
@@ -90,6 +90,7 @@ export const allowedFields = {
   displayTo: 'The to value, formatted for display',
   hasReleaseNotes: 'true if the upgrade has release notes',
   indentation: 'The indentation of the dependency being updated',
+  isGroup: 'true if the upgrade is part of a group',
   isLockfileUpdate: 'true if the branch is a lock file update',
   isMajor: 'true if the upgrade is major',
   isPatch: 'true if the upgrade is a patch upgrade',