diff --git a/man7/mount_namespaces.7 b/man7/mount_namespaces.7
index bcaeee90c..25017b84b 100644
--- a/man7/mount_namespaces.7
+++ b/man7/mount_namespaces.7
@@ -227,6 +227,12 @@ a new bind mount is created from the mount point.
 In both of these cases, the new mount point joins the peer group
 of which the existing mount point is a member.
 .PP
+A new peer group is also created when a child mount point is created under
+an existing mount point that is marked as shared.
+In this case, the new child mount point is also marked as shared and
+the resulting peer group consists of all the mount points
+that are replicated under the peers of parent mount.
+.PP
 A mount ceases to be a member of a peer group when either
 the mount is explicitly unmounted,
 or when the mount is implicitly unmounted because a mount namespace is removed