diff --git a/src/conventions.md b/src/conventions.md
index 89a98678..7c2a958c 100644
--- a/src/conventions.md
+++ b/src/conventions.md
@@ -11,7 +11,8 @@ rustc is slowly moving towards the [Rust standard coding style][fmt];
 at the moment, however, it follows a rather more *chaotic* style.  We
 do have some mandatory formatting conventions, which are automatically
 enforced by a script we affectionately call the "tidy" script.  The
-tidy script runs automatically when you do `./x.py test`.
+tidy script runs automatically when you do `./x.py test` and can be run 
+in isolation with `./x.py test src/tools/tidy`.
 
 [fmt]: https://github.com/rust-lang-nursery/fmt-rfcs