diff --git a/man2/pidfd_open.2 b/man2/pidfd_open.2
index 1ca0b8008..f77eed372 100644
--- a/man2/pidfd_open.2
+++ b/man2/pidfd_open.2
@@ -169,6 +169,10 @@ nothing can be read from the file descriptor
 .RB ( read (2)
 on the file descriptor fails with the error
 .BR EINVAL ).
+.IP *
+If the PID file descriptor refers to a child of the calling process,
+then it can be waited on using
+.BR waitid (2).
 .PP
 The
 .BR pidfd_open ()
@@ -182,7 +186,8 @@ However, the latter technique is possible only if the
 file system is mounted;
 furthermore, the file descriptor obtained in this way is
 .I not
-pollable.
+pollable and can't be waited on with
+.BR waitid (2).
 .SH EXAMPLE
 The program below opens a PID file descriptor for the
 process whose PID is specified as its command-line argument.
@@ -251,4 +256,5 @@ main(int argc, char *argv[])
 .BR pidfd_send_signal (2),
 .BR poll (2),
 .BR select (2),
+.BR waitid (2),
 .BR epoll (7)