diff --git a/man7/mount_namespaces.7 b/man7/mount_namespaces.7
index 6718ff53f..781817d5f 100644
--- a/man7/mount_namespaces.7
+++ b/man7/mount_namespaces.7
@@ -1064,7 +1064,8 @@ see
 .BR unshare (2),
 .BR proc (5),
 .BR namespaces (7),
-.BR user_namespaces (7)
+.BR user_namespaces (7),
+.BR findmnt (8)
 .PP
 .IR Documentation/filesystems/sharedsubtree.txt
 in the kernel source tree.