      
      - important: Comparison is done on `type` and `unit symbol`.
      
-     - parameter other: given `unit` to compare
+     - parameter other: given `other unit` to compare with.
+     
+     - author: Michal Konturek
      */
     public func equals(other: Unit) -> Bool {
         if other.dynamicType !== self.dynamicType {

     - parameter to: given `destination unit`.
     
     - returns: `amount` converted to `destination unit`.
     */
    public func convert(amount: NSNumber, to: Unit) -> NSNumber {
        return self.convert(amount, from: self, to: to)

     - parameter name: unit name.
     - parameter symbol: unit symbol.
     - parameter ratio: conversion ratio to a base unit.
     
     - author: Michal Konturek
     */
    public init(name: String, symbol: String, ratio: NSNumber) {
        self.name = name
