diff --git a/man2/setns.2 b/man2/setns.2
index b7a798c40..631635da3 100644
--- a/man2/setns.2
+++ b/man2/setns.2
@@ -80,15 +80,18 @@ and wants to ensure that the namespace is of a particular type.
 if the file descriptor was opened by another process and, for example,
 passed to the caller via a UNIX domain socket.)
 
-The PID namespace is a little different.
-Reassociating the calling
-thread with a PID namespace only changes the PID namespace that the
-child processes will be created in.
-
-Changing the PID namespace for child processes is only allowed if the
+.B CLONE_NEWPID
+behaves somewhat differently from the other
+.I nstype
+values:
+reassociating the calling thread with a PID namespace only changes
+the PID namespace that child processes of the caller will be created in;
+it does not change the PID namespace of the caller itself.
+Reassociating with a PID namespace is only allowed if the
 PID namespace specified by
 .IR fd
-is a child PID namespace of the PID namespace of the caller.
+is a descendant (child, grandchild, etc.)
+PID namespace of the PID namespace of the caller.
 
 A multi-threaded process may not change user namespace with
 .BR setns ().