diff --git a/lib/types/redux-types.js b/lib/types/redux-types.js
--- a/lib/types/redux-types.js
+++ b/lib/types/redux-types.js
@@ -182,6 +182,11 @@
 } from '../keyserver-conn/keyserver-conn-types.js';
 import type { SendMessageError } from '../utils/errors.js';
 
+// Before making changes here, make sure to consider how the added property
+// should be stored. Think about redux-persist or SQLite as storage,
+// backup and make sure blacklists/whitelists on all platforms are
+// reflecting that. Please also update the Notion doc with Redux state:
+// https://www.notion.so/commapp/Application-storage-1e3d823c518b807ab023daed163682b5#1e4d823c518b80bc97c2d0b5448413ad.
 export type BaseAppState<NavInfo: BaseNavInfo = BaseNavInfo> = {
   +navInfo: NavInfo,
   +currentUserInfo: ?CurrentUserInfo,
diff --git a/native/redux/state-types.js b/native/redux/state-types.js
--- a/native/redux/state-types.js
+++ b/native/redux/state-types.js
@@ -50,6 +50,11 @@
   'commServicesAccessToken',
 ];
 
+// Before making changes here, make sure to consider how the added property
+// should be stored. Think about redux-persist or SQLite as storage,
+// backup and make sure blacklists/whitelists on all platforms are
+// reflecting that. Please also update the Notion doc with Redux state:
+// https://www.notion.so/commapp/Application-storage-1e3d823c518b807ab023daed163682b5#1e4d823c518b80bc97c2d0b5448413ad.
 export type AppState = {
   +navInfo: NavInfo,
   +currentUserInfo: ?CurrentUserInfo,
diff --git a/web/redux/redux-setup.js b/web/redux/redux-setup.js
--- a/web/redux/redux-setup.js
+++ b/web/redux/redux-setup.js
@@ -99,6 +99,11 @@
   'customServer',
 ];
 
+// Before making changes here, make sure to consider how the added property
+// should be stored. Think about redux-persist or SQLite as storage,
+// backup and make sure blacklists/whitelists on all platforms are
+// reflecting that. Please also update the Notion doc with Redux state:
+// https://www.notion.so/commapp/Application-storage-1e3d823c518b807ab023daed163682b5#1e4d823c518b80bc97c2d0b5448413ad.
 export type AppState = {
   +navInfo: WebNavInfo,
   +currentUserInfo: ?CurrentUserInfo,