diff --git a/scripts/provision-groups.py b/scripts/provision-groups.py
index 08ae630..8444f04 100644
--- a/scripts/provision-groups.py
+++ b/scripts/provision-groups.py
@@ -7,7 +7,7 @@
 the memberships field in heros.yaml, and invokes the javabin-team-provisioner
 Lambda with action=sync_groups_and_heros.
 
-All heroes are implicitly members of the 'helter' group.
+All group memberships are explicit — heroes must list each group in their memberships field.
 
 Requires: aws CLI, PyYAML (available on GitHub Actions ubuntu-latest runners)
 """
diff --git a/scripts/sync-heros.py b/scripts/sync-heros.py
index 25fd0d2..04ffcf3 100644
--- a/scripts/sync-heros.py
+++ b/scripts/sync-heros.py
@@ -209,7 +209,7 @@ def format_yaml(members):
         "# creates a PR updating this file.",
         "#",
         "# Rules:",
-        "#   - All members are implicitly in the 'helter' group (not listed in memberships)",
+        "#   - The sync script auto-adds 'helter' to every hero's memberships",
         "#   - memberships references group names from groups.yaml",
         "#   - alias is optional — heroes can PR their preferred alias",
         "#   - javabin_google_email is the Google Workspace account (firstname.lastname@java.no)",