diff --git a/libc/kernel/uapi/linux/counter.h b/libc/kernel/uapi/linux/counter.h
index 4b86b28..f986365 100644
--- a/libc/kernel/uapi/linux/counter.h
+++ b/libc/kernel/uapi/linux/counter.h
@@ -46,6 +46,7 @@
   COUNTER_EVENT_THRESHOLD,
   COUNTER_EVENT_INDEX,
   COUNTER_EVENT_CHANGE_OF_STATE,
+  COUNTER_EVENT_CAPTURE,
 };
 struct counter_watch {
   struct counter_component component;
@@ -91,4 +92,8 @@
   COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
   COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
 };
+enum counter_signal_polarity {
+  COUNTER_SIGNAL_POLARITY_POSITIVE,
+  COUNTER_SIGNAL_POLARITY_NEGATIVE,
+};
 #endif