diff --git a/man2/sigaction.2 b/man2/sigaction.2
index b38a2fbf6..5bbed0740 100644
--- a/man2/sigaction.2
+++ b/man2/sigaction.2
@@ -303,6 +303,8 @@ siginfo_t {
                               occurred (since Linux 3.19) */
     void    *si_upper;     /* Upper bound when address violation
                               occurred (since Linux 3.19) */
+    int      si_pkey;      /* Protection key on PTE that caused
+                              fault (since Linux 4.6) */
     void    *si_call_addr; /* Address of system call instruction
                               (since Linux 3.5) */
     int      si_syscall;   /* Number of attempted system call
@@ -469,6 +471,13 @@ populates
 .IR si_lower
 and
 .IR si_upper .
+
+The
+.BR SEGV_PKUERR
+suberror of
+.B SIGSEGV
+populates
+.IR si_pkey .
 .IP *
 .BR SIGIO / SIGPOLL
 (the two names are synonyms on Linux)
@@ -638,6 +647,10 @@ Invalid permissions for mapped object.
 .BR SEGV_BNDERR " (since Linux 3.19)"
 .\" commit ee1b58d36aa1b5a79eaba11f5c3633c88231da83
 Failed address bound checks.
+.TP
+.BR SEGV_PKUERR " (since Linux 4.6)"
+.\" commit cd0ea35ff5511cde299a61c21a95889b4a71464e
+Protection key fault.
 .RE
 .PP
 The following values can be placed in