diff --git a/README.md b/README.md
index c8ecd51..4e684ac 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,37 @@
 # Avida-ED-App-Builder
 
-A repository for tooling to make single-file executables or installers for Windows/MacOS/Linux for Avida-ED versions 3 and 4.
\ No newline at end of file
+A repository for tooling to make single-file executables or installers for Windows/MacOS/Linux for Avida-ED versions 3 and 4.
+
+## Layout
+
+```
+Avida-ED-App-Builder/
+├── apps/
+│   ├── v3/                       # holds fetched Avida-ED 3 webroot (via compose target)
+│   └── v4/                       # holds fetched Avida-ED 4 webroot (via compose target)
+├── packaging/
+│   ├── linux/
+│   │   ├── Dockerfile.appimage
+│   │   ├── AppRun
+│   │   ├── make_appimage.sh
+│   │   └── desktop/avidaed.desktop
+│   ├── mac/
+│   │   ├── make_macos_bundle.sh
+│   │   └── Info.plist.tmpl
+│   └── windows/
+│       ├── make_windows_sfx.ps1
+│       ├── 7z.sfx                 # 7-Zip SFX module (binary, small)
+│       └── config.txt             # SFX config for silent extract+run
+├── server-ui/                     # Rust (wry + tiny-http) single-binary app
+│   ├── Cargo.toml
+│   ├── build.rs
+│   └── src/main.rs
+├── tools/
+│   ├── Dockerfile.fetch           # pulls known-good assets (from aed-docker or URL)
+│   ├── fetch_assets.sh
+│   └── inject_webroot.rs          # tiny helper to copy chosen webroot into ./server-ui/webroot/
+├── docker-compose.yml
+├── Makefile
+└── README.md
+```
+