diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 194a2b5aa563d1..1fc368c917823a 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2489,6 +2489,8 @@ dir_fd and follow_symlinks may not be implemented
 It's an error to use dir_fd or follow_symlinks when specifying path as
   an open file descriptor.
 
+TEST BPO-30259: Test somehow that generated files are up to date: run make regen-all.
+
 [clinic start generated code]*/
 
 static PyObject *