 
 final class FeedlyAccountDelegate: AccountDelegate {
 	
+	/// Feedly has a sandbox API and a production API.
+	/// This property is referred to when clients need to know which environment it should be pointing to.
 	static var environment: FeedlyAPICaller.API {
 		#if DEBUG
 		// https://developer.feedly.com/v3/developer/

	private let database: SyncDatabase
	
	private weak var currentSyncAllOperation: FeedlySyncAllOperation?
	
	init(dataFolder: String, transport: Transport?, api: FeedlyAPICaller.API) {
		
		if let transport = transport {
			caller = FeedlyAPICaller(transport: transport, api: api)
			
		} else {
			

		
		currentSyncAllOperation = operation
		
		operationQueue.addOperation(operation)
	}
	
	func sendArticleStatus(for account: Account, completion: @escaping ((Result<Void, Error>) -> Void)) {
