diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index d91089864..fc7481f2d 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -2911,6 +2911,11 @@ the cgroup file descriptor in
 .I pid
 is not valid.
 .TP
+.BR EBUSY " (since Linux 4.1)"
+.\" bed5b25ad9c8a2f5d735ef0bc746ec870c01c1b0
+Returned if another event already has exclusive
+access to the PMU.
+.TP
 .B EFAULT
 Returned if the
 .I attr