A Companion Specification and Vocabulary Primer is now available for public comment. This announcement comes nearly one year since the Vocabulary Considerations for XAPI white paper was published by ADL. Following the white paper, ADL facilitated by this W3C community-driven xAPI Vocabulary Working Group to investigate how to improve semantic interoperability for xAPI. These documents are applicable to anyone creating new vocabulary terms (Verbs or Activity Types) for xAPI. It is also applicable to any individuals or organizations developing applications for publishing, storing or retrieving vocabulary identifiers and definitions, or any other types of services that need to query the semantic meaning of xAPI vocabulary data. We are looking for community feedback on these documents before applying vocabulary-specific revisions to the core xAPI Specification.