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diff --git a/src/tools/clippy/src/docs/err_expect.txt b/src/tools/clippy/src/docs/err_expect.txt
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+++ b/src/tools/clippy/src/docs/err_expect.txt
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+### What it does
+Checks for `.err().expect()` calls on the `Result` type.
+
+### Why is this bad?
+`.expect_err()` can be called directly to avoid the extra type conversion from `err()`.
+
+### Example
+```
+let x: Result<u32, &str> = Ok(10);
+x.err().expect("Testing err().expect()");
+```
+Use instead:
+```
+let x: Result<u32, &str> = Ok(10);
+x.expect_err("Testing expect_err");
+```
+\ No newline at end of file