1 files changed, 22 insertions, 0 deletions

diff --git a/util-linux/umount.c b/util-linux/umount.c
index 5597d9eba..1e576ca4e 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -7,6 +7,28 @@
  *
  * Licensed under GPLv2, see file LICENSE in this source tree.
  */
+
+//usage:#define umount_trivial_usage
+//usage:       "[OPTIONS] FILESYSTEM|DIRECTORY"
+//usage:#define umount_full_usage "\n\n"
+//usage:       "Unmount file systems\n"
+//usage:     "\nOptions:"
+//usage:        IF_FEATURE_UMOUNT_ALL(
+//usage:     "\n        -a      Unmount all file systems" IF_FEATURE_MTAB_SUPPORT(" in /etc/mtab")
+//usage:        )
+//usage:        IF_FEATURE_MTAB_SUPPORT(
+//usage:     "\n        -n      Don't erase /etc/mtab entries"
+//usage:        )
+//usage:     "\n        -r      Try to remount devices as read-only if mount is busy"
+//usage:     "\n        -l      Lazy umount (detach filesystem)"
+//usage:     "\n        -f      Force umount (i.e., unreachable NFS server)"
+//usage:        IF_FEATURE_MOUNT_LOOP(
+//usage:     "\n        -d      Free loop device if it has been used"
+//usage:        )
+//usage:
+//usage:#define umount_example_usage
+//usage:       "$ umount /dev/hdc1\n"
+
 #include <mntent.h>
 #include <sys/mount.h>
 #include "libbb.h"