diff --git a/modules/restic/cmd/restic-backups/backups.go b/modules/restic/cmd/restic-backups/backups.go
index 8d2bdbc5..3b67e781 100644
--- a/modules/restic/cmd/restic-backups/backups.go
+++ b/modules/restic/cmd/restic-backups/backups.go
@@ -10,7 +10,8 @@
 // Each module gets one snapshot a night, tagged with its name, so a module is listed, kept and
 // restored on its own. Everything lands in one repository on the machine — deduplicated, so every
 // night is a complete restore point and only what changed costs space — and is thinned to 14 daily,
-// 8 weekly and 6 monthly unless the machine's settings say otherwise (retention.go). Against mistakes, not disasters: nothing leaves the machine.
+// 8 weekly and 6 monthly unless the machine's settings say otherwise (retention.go). Against
+// mistakes, not disasters: nothing leaves the machine.
 //
 // Root's: the dumps read every store and the repository holds every module's data, and the runtime
 // launching this binary runs as the operator's account, so restic and the run lines go through sudo
diff --git a/modules/restic/module.json b/modules/restic/module.json
index 6a2f67f4..da5af259 100644
--- a/modules/restic/module.json
+++ b/modules/restic/module.json
@@ -36,17 +36,17 @@
     "keep-daily": {
       "kind": "preference",
       "default": 14,
-      "why": "two weeks of nightly restore points undo a mistake noticed within a fortnight; a count from 1 to 9999, read by the night, which thins nothing while it does not read (novox/hq issue 416)"
+      "why": "two weeks of nightly restore points undo a mistake noticed within a fortnight; a count from 1 to 9999, read by the night, which thins nothing while it does not read (novox/hq issue 416); lowering it deletes the restore points beyond the new count at the next night, and that cannot be undone"
     },
     "keep-weekly": {
       "kind": "preference",
       "default": 8,
-      "why": "two months of weekly restore points behind the dailies; a count from 1 to 9999, refused by the night like keep-daily"
+      "why": "two months of weekly restore points behind the dailies; a count from 1 to 9999, refused by the night like keep-daily; lowering it deletes the restore points beyond the new count at the next night, and that cannot be undone"
     },
     "keep-monthly": {
       "kind": "preference",
       "default": 6,
-      "why": "half a year of monthly restore points behind the weeklies; a count from 1 to 9999, refused by the night like keep-daily"
+      "why": "half a year of monthly restore points behind the weeklies; a count from 1 to 9999, refused by the night like keep-daily; lowering it deletes the restore points beyond the new count at the next night, and that cannot be undone"
     }
   },
   "resources": [