(usage): Correct the description of --update.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/mv.c b/src/mv.c
index 35154abc1..a2f1a4c17 100644
--- a/src/mv.c
+++ b/src/mv.c
@@ -329,7 +329,9 @@ Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY.\n\
                                  argument\n\
   -S, --suffix=SUFFIX          override the usual backup suffix\n\
       --target-directory=DIRECTORY  move all SOURCE arguments into DIRECTORY\n\
-  -u, --update                 move only older or brand new non-directories\n\
+  -u, --update                 move only when the SOURCE file is newer\n\
+                                 than the destination file or when the\n\
+                                 destination file is missing\n\
   -v, --verbose                explain what is being done\n\
       --help                   display this help and exit\n\
       --version                output version information and exit\n\