         }
     }
     
-    public func build(scenesEnumName enumName: String? = "Scene", seguesEnumName: String? = "Segue", indentation indent : SwiftGenIndentation = .Spaces(4)) -> String {
+    public func build(scenesEnumName: String = "Scene", seguesEnumName: String = "Segue", indentation indent : SwiftGenIndentation = .Spaces(4)) -> String {
         var text = "// Generated using SwiftGen, by O.Halligon — https://github.com/AliSoftware/SwiftGen\n\n"
         let t = indent.string
         text += commonCode(indentationString: t)

        text += "extension UIStoryboard {\n"
      
        /// Scenes
        let s = enumName == nil ? "" : t
        if let enumName = enumName {
            text += "\(t)enum \(enumName.asSwiftIdentifier()) {\n"
        }
        for (name, scenes) in storyboardsScenes {
            let enumName = name.asSwiftIdentifier(forbiddenChars: "_")
            text += "\(s)\(t)enum \(enumName) : String, StoryboardScene {\n"

            
            text += "\(s)\(t)}\n"
        }
        text += "\(t)}\n"
      
        /// Segues
        if (storyboardsSegues.count > 0) {
          text += "\n"
          
          text += "\(t)enum \(seguesEnumName.asSwiftIdentifier()) {\n"
        
          for (name, segues) in storyboardsSegues
            where segues.count > 0 {
