diff --git a/docker/routlin-dash/GUIDE.md b/docker/routlin-dash/GUIDE.md
index bd24868..426c780 100644
--- a/docker/routlin-dash/GUIDE.md
+++ b/docker/routlin-dash/GUIDE.md
@@ -19,13 +19,14 @@ app/                  Python source (baked into image)
     <pagename>/
       content.json    Declarative page layout
       action.py       Flask Blueprint for POST actions on this page
+      page.js?        Optional page-specific client-side JS (auto-included if present)
   sanitize.py         Input sanitization (strips dangerous characters)
   config_utils.py     Config I/O, snapshot system, command queue
   authorized_accounts.json  Web UI user accounts (separate from Routlin users)
 
 data/                 Live-mounted at runtime (./data:/data)
   styles.css          Application stylesheet
-  common.js           Client-side interaction logic
+  common.js           Shared client-side interaction logic (all pages)
   validation.js       Client-side field validation
 
                       # host directory mounted into container: $HOME/routlin -> /routlin_location
@@ -198,6 +199,10 @@ bp = Blueprint(_PAGE, __name__)
 
 In `app/main.py` (or wherever blueprints are registered), add the new action blueprint alongside the existing ones.
 
+### 5. Add page.js (optional)
+
+If the page needs client-side behavior not shared with other pages, create `app/pages/<pagename>/page.js`. It is automatically included - no registration needed. See the "Page-Specific JavaScript" section for guidance on what belongs here vs `common.js`.
+
 ---
 
 ## Token System
@@ -375,6 +380,27 @@ For data that must be passed to a JS validator (such as existing VLAN IDs for un
 
 ---
 
+## Page-Specific JavaScript
+
+If a page needs client-side behavior that is not shared with any other page, put it in `app/pages/<pagename>/page.js`. `view_page.py` automatically appends this file to the inline script bundle when it exists.
+
+```
+app/pages/ddns/page.js               -- credential provider toggle
+app/pages/physicalinterfaces/page.js -- interface config card wiring
+app/pages/actions/page.js            -- history revert button state
+app/pages/networklayout/page.js      -- is_vpn -> mdns_reflection sync
+```
+
+`page.js` runs after `common.js` and `validation.js`, so all shared utilities (`htmlEsc`, `showCard`, `tablePickerCloseAll`, etc.) are available.
+
+Rules for what belongs in `page.js` vs `common.js`:
+
+- **`page.js`**: behavior that only activates on one page (specific field names, CSS classes, or form actions that appear nowhere else).
+- **`common.js`**: shared infrastructure used by multiple pages, or global event handlers (click-to-close, UUID hover highlight, stat card edit mode).
+- **Inline `<script>` from factory**: per-element wiring emitted by factory at render time (form validation, table-picker row wiring). Factory uses `document.currentScript.previousElementSibling` to scope the script to the element it follows.
+
+---
+
 ## JS Table Workers
 
 Non-standard `input_type` values in `inline_edit` row actions require a table worker. `factory.py` detects any `input_type` not in `STANDARD_INPUT_TYPES = {'text', 'password', 'number', 'checkbox', 'select', 'textarea'}` and emits a `<script>` block via `build_table_worker_script()` that registers the worker using `registerTableWorker(id, impl)`.
diff --git a/docker/routlin-dash/TYPES.md b/docker/routlin-dash/TYPES.md
index f1b74f7..337823a 100644
--- a/docker/routlin-dash/TYPES.md
+++ b/docker/routlin-dash/TYPES.md
@@ -456,7 +456,8 @@ JS-driven table where the user can add, edit, and remove rows. Submits as a JSON
 {
   "type": "readonly_select",
   "label?": "Gateway",
-  "name?": "gateway"
+  "name?": "gateway",
+  "hint?": "Helper text shown below the select."
 }
 ```
 Disabled `<select>` placeholder shown while dependent data is loading. JS replaces it with real options once identities are available.
@@ -470,7 +471,8 @@ Disabled `<select>` placeholder shown while dependent data is loading. JS replac
   "label": "Custom Rules",
   "name": "custom_rules",
   "override_name?": "custom_rules_override",
-  "validate?": "ip_in_subnet"
+  "validate?": "ip_in_subnet",
+  "hint?": "Helper text shown below the textarea."
 }
 ```
 Read-only textarea with an "Override" checkbox. Checking the box enables editing. `override_name` is the checkbox's `name` attribute and defaults to `{name}_override`.