Annotation is a crucial technique for guiding users through a complex sequence of steps such as operating a machine or familiarizing oneself with a new environment. In this work, we developed an annotation system for asynchronous collaboration on an optical see-through headmounted display. This system offers a set of capabilities for placing, playing back, and organizing virtual annotations to real-world objects. Perspectives of the annotator are recorded to preserve extra context information, allowing the viewer to review the content from any angle. The resulting system lays the foundation for content creation tools in head-mounted augmented reality displays, moving a step closer to an easy-to-use interactive annotation tool that allows general users to create and share meaningful content in mixed reality space.