document in readme about t-archive's --time

README.md

@@ -145,9 +145,10 @@ You can archive entries from a timesheet using:
 which defaults to archiving all entries in the current sheet, or you can be more
 specific using these options:
 
-    -s, --start <date:qs>     Include entries that start on this date or later
-    -e, --end <date:qs>       Include entries that start on this date or earlier
+    -s, --start <date:qs>     Include entries that start on this date or later.
+    -e, --end <date:qs>       Include entries that start on this date or earlier.
     -g, --grep <regexp>       Include entries where the note matches this regexp.
+    -t, --time <hours>        Only archive up to `hours` hours.
 
 This subcommand will move the selected entries to a hidden timesheet named
 `_[SHEET]` (the name of the timesheet preceded by an underscore).

src/main.rs

@@ -154,7 +154,7 @@ fn main() {
             )
             .arg(Arg::with_name("time")
                  .short("t").long("time")
-                 .takes_value(true)
+                 .takes_value(true).value_name("HOURS")
                  .help("Time in hours to archive. Archived time will be equal or less than this.")
             )
         )