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diff --git a/src/docs/mutex_atomic.txt b/src/docs/mutex_atomic.txt
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--- a/src/docs/mutex_atomic.txt
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-### What it does
-Checks for usages of `Mutex<X>` where an atomic will do.
-
-### Why is this bad?
-Using a mutex just to make access to a plain bool or
-reference sequential is shooting flies with cannons.
-`std::sync::atomic::AtomicBool` and `std::sync::atomic::AtomicPtr` are leaner and
-faster.
-
-### Known problems
-This lint cannot detect if the mutex is actually used
-for waiting before a critical section.
-
-### Example
-```
-let x = Mutex::new(&y);
-```
-
-Use instead:
-```
-let x = AtomicBool::new(y);
-```
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