README.md in timetrap-1.6.0 vs README.md in timetrap-1.6.1

@@ -30,11 +30,11 @@
     $ t s coding
     Switching to sheet coding
 
 Each timesheet contains *entries*.  Each entry has a start and end time, and a
 note associated with it.  An entry without an end time set is considered to be
-*running*.
+running.
 
 You check in to the current sheet with the `in` command.
 
     $ # check in with "document timetrap" note
     $ t in document timetrap
@@ -197,12 +197,12 @@
 
   usage: ``t out [--at TIME] [TIMESHEET]``
 
 **sheet**
   Switch to a timesheet creating it if necessary. The default timesheet is
-  called "default".
+  called "default". When no sheet is specified list all existing sheets.
 
-  usage: ``t sheet TIMESHEET``
+  usage: ``t sheet [TIMESHEET]``
 
 **week**
   Shortcut for display with start date set to monday of this week
 
   usage: ``t week [--ids] [--end DATE] [--format FMT] [TIMESHEET | all]``