README in ruby-units-0.2.0 vs README in ruby-units-0.2.1

@@ -1,8 +1,8 @@
 =Ruby Units
 
-Version: 0.1.0
+Version: 0.2.1
 
 Kevin C. Olbrich, Ph.D. 
 
 http://www.sciwerks.com
 
@@ -27,10 +27,15 @@
  unit = Unit.new("1 kg*m^2/s^2")  # complex unit
  unit = Unit.new("1 kg m^2 s^-2") # complex unit
  unit = Unit("1 mm")              # shorthand
  unit = "1 mm".to_unit            # convert string object
  unit = object.to_unit            # convert any object using object.to_s
+ unit = U'1 mm'
+ unit = u'1 mm'
+ unit = '1 mm'.unit
+ unit = '1 mm'.u
+ 
 
 ==Rules:  
 1. only 1 quantity per unit (with 2 exceptions... 6'5" and '8 lbs 8 oz')
 2. use SI notation when possible
 3. avoid using spaces in unit names
@@ -67,19 +72,49 @@
 
  unit1 = unit >> "ft"   # => convert to 'feet'
  unit >>= "ft"          # => convert and overwrite original object
  unit3 = unit1 + unit2  # => resulting object will have the units of unit1
  unit3 = unit1 - unit2  # => resulting object will have the units of unit1
- unit1 <=> unit2        # => does comparison on quantities in base units, throws an exception if not compatible
- unit1 === unit2        # => true if units and quantity are the same, even if 'equivalent' by <=>
+ unit1 <=> unit2        # => does comparison on quantities in base units, 
+                          throws an exception if not compatible
+ unit1 === unit2        # => true if units and quantity are the same, even if
+                          'equivalent' by <=>
+ unit.to('ft')          # convert
  
 ==Text Output
 Units will display themselves nicely based on the preferred abbreviation for the units and prefixes.
 Since Unit implements a Unit#to_s, all that is needed in most cases is:
  "#{Unit.new('1 mm')}"  #=> "1 mm"
  
 The to_s also accepts some options.
- Unit.new('1.5 mm').to_s("%0.2f")  # => "1.50 mm".  Enter any valid format string
- Unit.new('1.5 mm').to_s("in")     # => converts to inches before printing
- Unit.new("2 m").to_s(:ft)         #=> returns 6'7"
- Unit.new("100 kg").to_s(:lbs)     #=> returns 220 lbs, 7 oz
- 
\ No newline at end of file
+ Unit.new('1.5 mm').to_s("%0.2f")  # => "1.50 mm".  Enter any valid format
+                                      string.  Also accepts strftime format
+ U('1.5 mm').to_s("in")     # => converts to inches before printing
+ U("2 m").to_s(:ft)         #=> returns 6'7"
+ U("100 kg").to_s(:lbs)     #=> returns 220 lbs, 7 oz
+ 
+ 
+==Time Helpers
+
+Time, Date, and DateTime objects can have time units added or subtracted.
+
+Time.now + "10 min".u 
+
+Several helpers have also been defined.
+
+'min'.since('9/18/06 3:00pm')
+'min'.before('9/18/08 3:00pm')
+'days'.until('1/1/07')
+'5 min'.from(Time.now)
+'5 min'.from_now
+'5 min'.before_now
+'5 min'.before(Time.now)
+'10 min'.ago
+
+==Ranges
+
+[U('0 h')..U('10 h')].each {|x| p x}
+works so long as the starting point has an integer scalar
+
+==Math functions
+All Trig math functions (sin, cos, sinh, ...) can take a unit as their parameter.  It will be converted to radians and then used if possible.
+