diff --git a/doc/rust.md b/doc/rust.md
index 0c8d1c5a140..3f2943f750c 100644
--- a/doc/rust.md
+++ b/doc/rust.md
@@ -2731,6 +2731,7 @@ The kinds are:
   : This kind includes all types that can be copied. All types with
     sendable kind are copyable, as are managed boxes, managed closures,
     trait types, and structural types built out of these.
+    Types with destructors (types that implement `Drop`) can not implement `Copy`.
 _Default_
   : Types with destructors, closure environments,
     and various other _non-first-class_ types,