diff --git a/man2/poll.2 b/man2/poll.2
index 157c2b28b..a40896969 100644
--- a/man2/poll.2
+++ b/man2/poll.2
@@ -162,8 +162,22 @@ are defined in \fI<poll.h>\fP:
 There is data to read.
 .TP
 .B POLLPRI
-There is urgent data to read (e.g., out-of-band data on TCP socket;
-pseudoterminal master in packet mode has seen state change in slave).
+There is some exceptional condition on the file descriptor.
+Possibilities include:
+.RS
+.IP * 3
+There is out-of-band data on a TCP socket (see
+.BR tcp (7)).
+.IP *
+A pseudoterminal master in packet mode has seen a state change on the slave
+(see
+.BR ioctl_tty (2)).
+.IP *
+A
+.I cgroup.events
+file has been modified (see
+.BR cgroups (7)).
+.RE
 .TP
 .B POLLOUT
 Writing is now possible, though a write larger that the available space