diff --git a/README.md b/README.md
index b88f0f875dba049291a7c2b84d91ae79065936dc..9c2fe11221e15426f0160e137a00db2a3de6ab6f 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,8 @@ All flags are optional if configured in `~/.config/garble/config.toml`.
 | `--model`      | Model ID                                    | `gpt-4o`, `claude-3-opus`, `gemini-1.5-pro` |
 | `--directions` | Instructions for how to transform the input | `"fix grammar and spelling"`                |
 
+Valid provider and model IDs are listed at https://catwalk-fe.secluded.site (an unofficial frontend for Charm's [Catwalk](https://github.com/charmbracelet/catwalk) service).
+
 ### Configuration
 
 Create `~/.config/garble/config.toml`: