diff --git a/PERMISSIONS.md b/PERMISSIONS.md
index 221c5a0..3fb6d6f 100644
--- a/PERMISSIONS.md
+++ b/PERMISSIONS.md
@@ -216,6 +216,7 @@ grant assignment.
 
 #### Permission Inheritance
 
+- **Writer**: inherited from parent B2B Organization, child B2B Organization
 - **Auditor**: inherited from parent B2B Organization, child B2B Organization, Project Membership Key Contact
 
 ---
diff --git a/charts/lfx-platform/files/model.fga b/charts/lfx-platform/files/model.fga
index 0d441dc..dc520ea 100644
--- a/charts/lfx-platform/files/model.fga
+++ b/charts/lfx-platform/files/model.fga
@@ -353,9 +353,11 @@ type b2b_org
     define owner: [user]
     # @fgadoc:jtbd Update org details & access settings
     # @fgadoc:jtbd Manage membership committee seat assignments
-    define writer: [user] or owner or global_org_admin
-    # auditor cascades transitively up and down the hierarchy via parent/child.
-    # writer does NOT cascade — edit scope stays on the directly-assigned org only.
+    define writer: [user] or owner or global_org_admin or writer from parent or writer from child
+    # writer and auditor both cascade transitively up and down the hierarchy via
+    # parent/child (LFXV2-3029) — an editor on any organization in a connected
+    # parent-child-sibling group is an editor on every member of that group,
+    # matching the auditor traversal below.
     # @fgadoc:jtbd View org details, settings & committee seats
     # @fgadoc:jtbd View org workspaces & workspace projects
     define auditor: [user, team#member] or writer or auditor from parent or auditor from child or key_contact from membership
diff --git a/charts/lfx-platform/templates/openfga/model.yaml b/charts/lfx-platform/templates/openfga/model.yaml
index 4cb78fa..7a6d7e1 100644
--- a/charts/lfx-platform/templates/openfga/model.yaml
+++ b/charts/lfx-platform/templates/openfga/model.yaml
@@ -28,7 +28,7 @@ spec:
     - version:
         major: 14
         minor: 3
-        patch: 0
+        patch: 1
       authorizationModel: |
 {{ .Files.Get "files/model.fga" | indent 8 }}
 {{- end }}