In 1995, the International Code of Zoological Nomenclature was under development for the revised fourth edition (to be published in 1999). In the development, a recommendation was made for a process of "international notification" for new names in zoology. Since the "Zoological Record" indexes approximately 90% of the world literature on zoological nomenclature, it was seen as a good starting place for that process of notification. In response to this need, BIOSIS developed the Index to Organism Names (ION), a free and freely accessible database that serves as an index to those names published in the Zoological Record. When BIOSIS was purchased by Thomson Reuters, ION was updated with names from additional databases, such as BIOSIS Previews and Biological Abstracts.