The Akkadian (Babylonian-Assyrian) lexicon is currently accessible via two reference dictionaries, Wolfram von Soden’s Akkadisches Handwörterbuch (1958–1981) and The Assyrian Dictionary of the University of Chicago (1956–2010). However, due to a large number of new cuneiform texts published during the last decades, both dictionaries are outdated in part, especially in their earlier volumes. The Supplement to the Akkadian Dictionaries (SAD), funded by the Deutsche Forschungsgemeinschaft, is meant to update both dictionaries. Without any claim to be comprehensive, SAD evaluates a strictly defined text corpus and a limited amount of secondary literature. SAD pays particular attention to new words, new verbal stems, and references which expand the distribution of a word or help to define its meaning, form or etymology. SAD volume B, P contains 591 lemmata, among them 127 new words. The introduction presents a concise history of Akkadian lexicography and describes SAD in detail.