diff --git a/libc/kernel/uapi/linux/psample.h b/libc/kernel/uapi/linux/psample.h
index c82e76e..f9f979c 100644
--- a/libc/kernel/uapi/linux/psample.h
+++ b/libc/kernel/uapi/linux/psample.h
@@ -22,6 +22,8 @@
   PSAMPLE_ATTR_LATENCY,
   PSAMPLE_ATTR_TIMESTAMP,
   PSAMPLE_ATTR_PROTO,
+  PSAMPLE_ATTR_USER_COOKIE,
+  PSAMPLE_ATTR_SAMPLE_PROBABILITY,
   __PSAMPLE_ATTR_MAX
 };
 enum psample_command {