diff --git a/libc/kernel/uapi/asm-generic/siginfo.h b/libc/kernel/uapi/asm-generic/siginfo.h
index f9199e5..c5e4178 100644
--- a/libc/kernel/uapi/asm-generic/siginfo.h
+++ b/libc/kernel/uapi/asm-generic/siginfo.h
@@ -80,6 +80,7 @@
       struct {
         unsigned long _data;
         __u32 _type;
+        __u32 _flags;
       } _perf;
     };
   } _sigfault;
@@ -125,6 +126,7 @@
 #define si_pkey _sifields._sigfault._addr_pkey._pkey
 #define si_perf_data _sifields._sigfault._perf._data
 #define si_perf_type _sifields._sigfault._perf._type
+#define si_perf_flags _sifields._sigfault._perf._flags
 #define si_band _sifields._sigpoll._band
 #define si_fd _sifields._sigpoll._fd
 #define si_call_addr _sifields._sigsys._call_addr
@@ -197,6 +199,7 @@
 #define TRAP_UNK 5
 #define TRAP_PERF 6
 #define NSIGTRAP 6
+#define TRAP_PERF_FLAG_ASYNC (1u << 0)
 #define CLD_EXITED 1
 #define CLD_KILLED 2
 #define CLD_DUMPED 3