diff --git a/man2/sigaction.2 b/man2/sigaction.2
index 89ade6042..c06037552 100644
--- a/man2/sigaction.2
+++ b/man2/sigaction.2
@@ -560,6 +560,12 @@ process breakpoint
 .TP
 .B TRAP_TRACE
 process trace trap
+.TP
+.BR TRAP_BRANCH " (since Linux 2.4)"
+process taken branch trap
+.TP
+.BR TRAP_HWBKPT " (since Linux 2.4)"
+hardware breakpoint/watchpoint
 .RE
 .PP
 The following values can be placed in