README.md in fugit-1.1.4 vs README.md in fugit-1.1.5

@@ -61,9 +61,10 @@
 p c.next_time      # => 2017-01-08 00:00:00 +0900
 p c.previous_time  # => 2017-01-01 00:00:00 +0900
 
 p c.brute_frequency  # => [ 604800, 604800, 53 ]
                      #    [ delta min, delta max, occurrence count ]
+p c.rough_frequency  # => 7 * 24 * 3600 (7d rough frequency)
 
 p c.match?(Time.parse('2017-08-06'))  # => true
 p c.match?(Time.parse('2017-08-07'))  # => false
 p c.match?('2017-08-06')              # => true
 p c.match?('2017-08-06 12:00')        # => false