message: Add update comment
diff: @@ -19,4 +19,7 @@ export interface AccessKey {
  secret: string;
  }
  -export interface ShadowsocksServer { update(keys: AccessKey[]): Promise<void>; }
  +export interface ShadowsocksServer {
  + // Updates the server to accept only the given access keys.
  + update(keys: AccessKey[]): Promise<void>;
  +}
  