diff --git a/doc/USAGE.md b/doc/USAGE.md
index 578927a..17681f2 100644
--- a/doc/USAGE.md
+++ b/doc/USAGE.md
@@ -192,6 +192,15 @@ mv $OLLIE/a/old.json $OLLIE/a/new.json       # rename
 rm $OLLIE/a/scratch.json                      # delete
 ```
 
+## Alternative front-ends
+
+The `s/sh` shell and `b/*` scripts are the lowest-level interface to ollie. Two higher-level front-ends are available:
+
+- **[ollie-tui](https://github.com/lneely/ollie-tui)** — terminal UI with a readline loop, split input, and output rendering. The reference interactive front-end.
+- **[ollie-el](https://github.com/lneely/ollie-el)** — Emacs front-end with a chat buffer, prompt composition, interrupt handling, and session management.
+
+Both speak directly to the ollie-9p filesystem — no separate protocol. See each repo's README for installation and usage.
+
 ## Example session
 
 ```sh