README.md: Slightly enhance backup-script-wrapper usage information

diff --git a/README.md b/README.md
index 893344cfbf5c3d43dc3525a4e33a6fd4e6c87278..b437ddffd7bfbe6f265db7a191bb979345f8f7a5 100644 (file)
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ When no *system* is given, all defined systems are backed up.
 
 Backup all systems and mail the report to "root".
 
-Usage: `backup-script-wrapper`
+Usage: `backup-script-wrapper [<backup-script-options-and-systems ...>]`
 
 ### backup-status