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diff --git a/compiler/rustc_error_codes/src/error_codes/E0206.md b/compiler/rustc_error_codes/src/error_codes/E0206.md
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+The `Copy` trait was implemented on a type which is neither a struct nor an
+enum.
+
+Erroneous code example:
+
+```compile_fail,E0206
+#[derive(Copy, Clone)]
+struct Bar;
+
+impl Copy for &'static mut Bar { } // error!
+```
+
+You can only implement `Copy` for a struct or an enum.
+The previous example will fail because `&'static mut Bar`
+is not a struct or enum.