diff --git a/Cargo.toml b/Cargo.toml
index 06c0966..e6bf3f5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,6 +34,11 @@ shadow_reuse = "deny"
 shadow_same = "deny"
 shadow_unrelated = "deny"
 
+# The wrappers' private field is deliberately type-erased and therefore cannot
+# express Send/Sync structurally. Their audited APIs preserve the element bounds
+# documented on the corresponding unsafe implementations.
+non_send_fields_in_send_ty = { level = "allow", priority = 1 }
+
 # Force using expect and providing a reason
 allow_attributes = "deny"
 allow_attributes_without_reason = "deny"