diff --git a/BACKLOG.md b/BACKLOG.md
index fb72930..1a66873 100644
--- a/BACKLOG.md
+++ b/BACKLOG.md
@@ -22,7 +22,12 @@ When creating a unit or group, allow the user to optionally supply their own ID.
 - If the user types into the ID field, stop auto-generating and use what they typed.
 - Validate: IDs must be unique and slug-safe.
 
-### Admin: "Delete" action in the bulk actions menu
+### Admin: allow renaming group IDs
+The group edit form currently does not expose the `id` field. Since storage is a flat
+JSON file, renaming a group ID is straightforward: update `groups[].id` and rewrite
+every `units[].group` reference in the same atomic save. Should also validate the new
+ID is unique and kebab-safe before committing.
+
 Add a "Delete" option to the bulk action dropdown so multiple units can be deleted at
 once. Should show a confirmation dialog listing the units to be deleted before
 committing. Related to the immediate fix below (ungrouped bulk actions).