The HI4PI data release comprises 21-cm neutral atomic hydrogen data of the Milky Way (-600km/s%3Cvlsr%3C+600km/s for declination >0deg; -470km/s%3Cvlsr%3C+470km/s for declination %3C0deg) as observed with the 100-m radio telescope at Effelsberg and the 64-m radio telescope at Parkes. HI4PI covers the full 4-pi sky. Original acknowledgement for data: Benjamin Winkel, bwinkel(at)mpifr.de