update usage

syncthing-resolve-conflicts

@@ -72,18 +72,20 @@ usage() {
 ${myname} v${myver}
 
 Inspired by 'pacdiff'. A simple program to merge or remove sync conflicts.
-Locate is used to find conflicts. In case the database is not recent, run
-'updatedb'.
+'locate' (or 'find', see -f option) is used to find conflicts. In case the
+database is not recent, run 'updatedb'.
 
-Usage: $myname [-o] [-f] [--nocolor]
+Usage: $myname [-d DIR] [-f] [-o] [--nocolor]
 
 General Options:
-  -o/--output       print files instead of merging them
-  -f/--find         use find instead of locate; scans only the home directory
-                    of the current user
-  --nocolor         remove colors from output
-  -v/--version      print version and exit
-  -h/--help         print usage and exit
+  -d/--directory DIR  only scan for sync conflicts in the directory DIR
+  -f/--find           use find instead of locate; by default, scan the home
+                      directory of the current user, but please see the -d
+                      option
+  -o/--output         print files instead of merging them
+  --nocolor           remove colors from output
+  -v/--version        print version and exit
+  -h/--help           print usage and exit
 
 Environment Variables:
   DIFFPROG          override the merge program: (default: 'vim -d')