diff --git a/man7/pid_namespaces.7 b/man7/pid_namespaces.7
index 025df56e3..cbb03233b 100644
--- a/man7/pid_namespaces.7
+++ b/man7/pid_namespaces.7
@@ -221,6 +221,10 @@ with the
 .BR CLONE_NEWPID
 flag cause children subsequently created
 by the caller to be placed in a different PID namespace from the caller.
+(Since Linux 4.12, that PID namespace is shown via the
+.IR /proc/[pid]/ns/pid_for_children
+file, as described in
+.BR namespaces (7).)
 These calls do not, however,
 change the PID namespace of the calling process,
 because doing so would change the caller's idea of its own PID