diff --git a/rust-sized-chunks.spec b/rust-sized-chunks.spec
index 9c9f46e..9eef932 100644
--- a/rust-sized-chunks.spec
+++ b/rust-sized-chunks.spec
@@ -1,4 +1,5 @@
 # Generated by rust2rpm 9
+# * proptest-derive is not packaged
 %bcond_without check
 %global debug_package %{nil}