diff --git a/README.md b/README.md
index c5c7766..d0ae3d5 100644
--- a/README.md
+++ b/README.md
@@ -1,28 +1,26 @@
-# notescraft-grammars
+# notescraft-registry
 
-Syntax grammars for NotesCraft. The app reads `index.json`, then downloads one grammar file from `grammars/` on demand.
+Downloadable extras for NotesCraft: syntax grammars, plugins, themes and templates. The app reads `index.json`, then downloads one file on demand from the matching folder.
 
 ## index.json
 
-```json
-{
-  "version": 1,
-  "grammars": [
-    {
-      "name": "zig",
-      "aliases": ["zig"],
-      "file": "grammars/zig.sublime-syntax",
-      "format": "sublime-syntax",
-      "scope": "source.zig",
-      "size": 31000,
-      "sha256": "<hex digest of the file>",
-      "license": "MIT",
-      "source": "<upstream url>"
-    }
-  ]
-}
-```
+Four lists, one per folder: `grammars`, `plugins`, `themes`, `templates`. Every entry has:
 
-- `format`: `sublime-syntax` (final format is confirmed by the app prototype).
-- `size` is in bytes; the app rejects a file that differs from it or from `sha256`.
-- Add only grammars whose license allows redistribution, and record it in `license` and `source`.
+| Field | Meaning |
+|---|---|
+| `name` | Unique id inside its list (lowercase, `-` allowed) |
+| `title` | Display name |
+| `aliases` | Other names the app should match (grammars: fence labels) |
+| `file` | Path inside this repository |
+| `size` | Bytes; the app rejects a file that differs |
+| `sha256` | Hex digest; the app rejects a file that differs |
+| `license` | SPDX id; only redistributable work is added |
+| `source` | Upstream URL |
+
+Grammar entries also carry `format` (`sublime-syntax`, final format confirmed by the app prototype) and `scope` (for example `source.zig`).
+
+```json
+{ "name": "zig", "title": "Zig", "aliases": ["zig"], "file": "grammars/zig.sublime-syntax",
+  "format": "sublime-syntax", "scope": "source.zig", "size": 31000,
+  "sha256": "<hex digest>", "license": "MIT", "source": "<upstream url>" }
+```
diff --git a/grammars/.gitkeep b/grammars/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/index.json b/index.json
index 09f683a..c617476 100644
--- a/index.json
+++ b/index.json
@@ -1,4 +1,7 @@
 {
   "version": 1,
-  "grammars": []
+  "grammars": [],
+  "plugins": [],
+  "themes": [],
+  "templates": []
 }
diff --git a/plugins/.gitkeep b/plugins/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/templates/.gitkeep b/templates/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/themes/.gitkeep b/themes/.gitkeep
new file mode 100644
index 0000000..e69de29