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diff --git a/src/docs/inefficient_to_string.txt b/src/docs/inefficient_to_string.txt
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-### What it does
-Checks for usage of `.to_string()` on an `&&T` where
-`T` implements `ToString` directly (like `&&str` or `&&String`).
-
-### Why is this bad?
-This bypasses the specialized implementation of
-`ToString` and instead goes through the more expensive string formatting
-facilities.
-
-### Example
-```
-// Generic implementation for `T: Display` is used (slow)
-["foo", "bar"].iter().map(|s| s.to_string());
-
-// OK, the specialized impl is used
-["foo", "bar"].iter().map(|&s| s.to_string());
-```
\ No newline at end of file