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diff --git a/src/tools/clippy/src/docs/suspicious_op_assign_impl.txt b/src/tools/clippy/src/docs/suspicious_op_assign_impl.txt
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+++ b/src/tools/clippy/src/docs/suspicious_op_assign_impl.txt
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+### What it does
+Lints for suspicious operations in impls of OpAssign, e.g.
+subtracting elements in an AddAssign impl.
+
+### Why is this bad?
+This is probably a typo or copy-and-paste error and not intended.
+
+### Example
+```
+impl AddAssign for Foo {
+    fn add_assign(&mut self, other: Foo) {
+        *self = *self - other;
+    }
+}
+```
+\ No newline at end of file