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diff --git a/src/tools/clippy/src/docs/iter_count.txt b/src/tools/clippy/src/docs/iter_count.txt
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+++ b/src/tools/clippy/src/docs/iter_count.txt
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+### What it does
+Checks for the use of `.iter().count()`.
+
+### Why is this bad?
+`.len()` is more efficient and more
+readable.
+
+### Example
+```
+let some_vec = vec![0, 1, 2, 3];
+
+some_vec.iter().count();
+&some_vec[..].iter().count();
+```
+
+Use instead:
+```
+let some_vec = vec![0, 1, 2, 3];
+
+some_vec.len();
+&some_vec[..].len();
+```
+\ No newline at end of file