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diff --git a/src/librustc_error_codes/error_codes/E0634.md b/src/librustc_error_codes/error_codes/E0634.md
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+A type has conflicting `packed` representation hint.
+
+Erroneous code examples:
+
+```compile_fail,E0634
+#[repr(packed, packed(2))] // error!
+struct Company(i32);
+
+#[repr(packed(2))] // error!
+#[repr(packed)]
+struct Company(i32);
+```
+
+You cannot use conflicting `packed` hint on a same type. If you want to pack a
+type to a given size, you should provide a size to packed:
+
+```
+#[repr(packed)] // ok!
+struct Company(i32);
+```