diff --git a/sys-utils/mount.8 b/sys-utils/mount.8
index b20a5c8b7..488403717 100644
--- a/sys-utils/mount.8
+++ b/sys-utils/mount.8
@@ -644,6 +644,10 @@ This is necessary for example when
 .I /etc
 is on a read-only filesystem.
 .TP
+.BR \-N , " \-\-namespace " \fIns
+Perform mount in namespace specified by \fIns\fR.
+\fIns\fR is typically in form \fI/proc/[pid]/ns/mnt\fR.
+.TP
 .BR \-O , " \-\-test\-opts " \fIopts
 Limit the set of filesystems to which the
 .B \-a
diff --git a/sys-utils/mount.c b/sys-utils/mount.c
index 3811379b4..a0dba721a 100644
--- a/sys-utils/mount.c
+++ b/sys-utils/mount.c
@@ -431,6 +431,8 @@ static void __attribute__((__noreturn__)) usage(void)
 	" -v, --verbose           say what is being done\n"));
 	fprintf(out, _(
 	" -w, --rw, --read-write  mount the filesystem read-write (default)\n"));
+	fprintf(out, _(
+	" -N, --namespace <ns>    perform mount in another namespace\n"));
 
 	fputs(USAGE_SEPARATOR, out);
 	printf(USAGE_HELP_OPTIONS(25));
diff --git a/sys-utils/umount.8 b/sys-utils/umount.8
index fb0601c6d..f09b1eae6 100644
--- a/sys-utils/umount.8
+++ b/sys-utils/umount.8
@@ -127,6 +127,10 @@ recommended use-case for \fBumount -l\fR is to prevent hangs on shutdown due to
 an unreachable network share where a normal umount will hang due to a downed
 server or a network partition. Remounts of the share will not be possible.
 
+.TP
+.BR \-N , " \-\-namespace " \fIns
+Perform umount in namespace specified by \fIns\fR.
+\fIns\fR is typically in form \fI/proc/[pid]/ns/mnt\fR.
 .TP
 .BR \-n , " \-\-no\-mtab"
 Unmount without writing in
diff --git a/sys-utils/umount.c b/sys-utils/umount.c
index 629c65df8..991adf760 100644
--- a/sys-utils/umount.c
+++ b/sys-utils/umount.c
@@ -100,6 +100,7 @@ static void __attribute__((__noreturn__)) usage(void)
 	fputs(_(" -r, --read-only         in case unmounting fails, try to remount read-only\n"), out);
 	fputs(_(" -t, --types <list>      limit the set of filesystem types\n"), out);
 	fputs(_(" -v, --verbose           say what is being done\n"), out);
+	fputs(_(" -N, --namespace <ns>    perform umount in another namespace\n"), out);
 
 	fputs(USAGE_SEPARATOR, out);
 	printf(USAGE_HELP_OPTIONS(25));