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diff --git a/src/docs/let_underscore_lock.txt b/src/docs/let_underscore_lock.txt
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index bd8217fb58b..00000000000
--- a/src/docs/let_underscore_lock.txt
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-### What it does
-Checks for `let _ = sync_lock`.
-This supports `mutex` and `rwlock` in `std::sync` and `parking_lot`.
-
-### Why is this bad?
-This statement immediately drops the lock instead of
-extending its lifetime to the end of the scope, which is often not intended.
-To extend lock lifetime to the end of the scope, use an underscore-prefixed
-name instead (i.e. _lock). If you want to explicitly drop the lock,
-`std::mem::drop` conveys your intention better and is less error-prone.
-
-### Example
-```
-let _ = mutex.lock();
-```
-
-Use instead:
-```
-let _lock = mutex.lock();
-```
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