diff --git a/CLAUDE.md b/CLAUDE.md
index 84d71eb60..5f363bc7c 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -14,3 +14,7 @@ The OpenAPI spec at `docs/api-reference/arc-api.yaml` is the source of truth for
 3. Write/update handler in `crates/arc-api/src/server.rs`, add route to `build_router()`
 4. `cargo test -p arc-api` — conformance test catches spec/router drift
 5. `cd packages/arc-api-client && bun run generate` — regenerates TypeScript Axios client
+
+## Testing workflows
+
+When manually testing workflows with `arc run start`, use `--no-retro` to skip the retro step and finish faster.