diff --git a/docs/04-development/02-content-system.md b/docs/04-development/02-content-system.md
index b821dbb..302976c 100644
--- a/docs/04-development/02-content-system.md
+++ b/docs/04-development/02-content-system.md
@@ -54,6 +54,7 @@ Returns flat key-value array with a special `_raw` key containing the full parse
 | `order` | string | `"descending"` | List sort direction (`ascending`\|`descending`) |
 | `redirect` | string | — | External URL (list items can redirect) |
 | `feed` | bool | `false` | Enable Atom feed on list pages (`feed.xml`) |
+| `author` | string | title | Atom feed author name (falls back to page title) |
 | `plugins` | string | — | Comma-separated page-level plugin names |
 
 ### Settings Section
diff --git a/docs/04-development/07-rendering.md b/docs/04-development/07-rendering.md
index c2d1de1..a761287 100644
--- a/docs/04-development/07-rendering.md
+++ b/docs/04-development/07-rendering.md
@@ -57,6 +57,8 @@ Handled in `router.php` before `parseRequestPath()`. When a request path ends wi
 
 Feed piggybacks on the existing Markdown cache — no separate feed cache needed. The `rawDate` field on items provides ISO dates for Atom `<updated>` elements. Content is wrapped in `<![CDATA[...]]>` with `]]>` safely escaped.
 
+**Date deduplication:** Atom requires unique `<updated>` timestamps per entry. Items sharing the same date get seconds incremented (`T00:00:00Z`, `T00:00:01Z`, etc.) to ensure uniqueness while preserving sort order.
+
 ## Markdown Caching
 
 Defined in `app/cache.php`. File-based cache in `/tmp/folderweb_cache/`.
@@ -87,7 +89,9 @@ Files not in this list are not served as static assets.
 
 ### Custom Assets (router.php)
 
-Files in `custom/assets/` are served at the document root URL. Example: `custom/assets/favicon.ico` → `/favicon.ico`. Uses `mime_content_type()` for MIME detection.
+Files in `custom/assets/` are served at the document root URL. Example: `custom/assets/favicon.ico` → `/favicon.ico`. Uses an explicit MIME type map; falls back to `application/octet-stream`.
+
+Cache-Control headers: `json` and `geojson` files get `max-age=60` (short TTL for data files); all other asset types get `max-age=31536000` (1 year, immutable).
 
 ### Framework Assets (static.php)