      - parameter to: `destination unit`.
      
      - returns: `amount` converted from a `source unit` to a `destination unit`.
+     
+     - author: Michal Konturek
      */
     func convert(amount: NSNumber, from: Unit, to: Unit) -> NSNumber
     
     /**
-     Indicates if a `current unit` is convertible with an `other unit`.
+     Returns `true` if a `current unit` is convertible with an `other unit`.
+     
+     - parameter with: given `other unit` to compare with.
+     
+     - author: Michal Konturek
      */
     func isConvertible(with: Unit) -> Bool
 }

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

     - parameter to: `destination unit`.
     
     - returns: `amount` converted from a `source unit` to a `destination unit`.
     
     - author: Michal Konturek
     */
    public func convert(amount: NSNumber, from: Unit, to: Unit) -> NSNumber {
        let baseAmount = from.convertToBaseUnit(amount)
