Address review comment

Author: JohnTitor

README.md

@@ -103,8 +103,9 @@ There is not a workaround for this error at the moment.  Comment out the `[outpu
 
 ## How to fix toolstate failures
 
-> **NOTE**: Currently, we do not track the toolstate due to the spurious failure,
-but we leave this for when we do it again in the future.
+> **NOTE**: Currently, we do not track the rustc-dev-guide toolstate due to
+[the spurious failure](https://github.com/rust-lang/rust/pull/71731),
+but we leave this instructions for when we do it again in the future.
 
 1. You will get a ping from the toolstate commit. e.g. https://github.com/rust-lang-nursery/rust-toolstate/commit/8ffa0e4c30ac9ba8546b7046e5c4ccc2b96ebdd4