diff --git a/man2/ptrace.2 b/man2/ptrace.2
index ea0087800..f6787f82f 100644
--- a/man2/ptrace.2
+++ b/man2/ptrace.2
@@ -356,6 +356,21 @@ If this flag is not set, signals are read from a per-thread queue.
 .in
 .PP
 .TP
+.BR PTRACE_GETSIGMASK " (since Linux 3.11)"
+.\" commit 29000caecbe87b6b66f144f72111f0d02fbbf0c1
+Retrieve mask of blocked signals to the address
+.I data.
+The
+.I addr
+argument contains the size of mask.
+.TP
+.BR PTRACE_SETSIGMASK " (since Linux 3.11)"
+Change mask of blocked signals from the address
+.I data.
+The
+.I addr
+argument contains the size of mask.
+.TP
 .BR PTRACE_SETOPTIONS " (since Linux 2.4.6; see BUGS for caveats)"
 Set ptrace options from
 .IR data .