Most existing augmented reality systems only provide a method for browsing information that is situated in the real world context. This paper describes a system that allows users to dynamically attach newly created digital information such as voice notes or photographs to the physical environment, through wearable computers as well as normal computers. Attached data is stored with contextual tags such as location IDs and object IDs that are obtained by wearable sensors, so the same or other wearable users can notice them when they come to the same context. Similar to the role that Post-it notes play in community messaging, we expect our proposed method to be a fundamental communication platform when wearable computers become commonplace.