diff --git a/man2/pivot_root.2 b/man2/pivot_root.2
index 3cca8a30d..6c84977d1 100644
--- a/man2/pivot_root.2
+++ b/man2/pivot_root.2
@@ -220,6 +220,8 @@ without needing to create and remove a temporary directory:
 .in +4n
 .EX
 chdir(new_root);
+mount("", ".", MS_SLAVE | MS_REC, NULL);
+        /* Or: MS_PRIVATE | MS_REC */
 pivot_root(".", ".");
 umount2(".", MNT_DETACH);
 .EE