diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index 1413ff442..06822f394 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -2943,6 +2943,16 @@ even though the ring-buffer remains empty.
 The argument is an unsigned 32-bit integer.
 A nonzero value pauses the ring-buffer, while a
 zero value resumes the ring-buffer.
+.TP
+.BR PERF_EVENT_MODIFY_ATTRIBUTES " (since Linux 4.17)"
+.\" commit 32ff77e8cc9e66cc4fb38098f64fd54cc8f54573
+This allows modifying an existing event without the overhead
+of closing and reopening a new event.
+Currently this is only supported for breakpoint events.
+.IP
+The argument is a pointer to a
+.I perf_event_attr
+structure containing the updated event settings.
 .\"
 .SS Using prctl(2)
 A process can enable or disable all currently open event groups