This is an announcement for the paper "A local Mazur-Ulam theorem" by Osamu Hatori. Abstract: We prove a local version of the Mazur-Ulam theorem. Archive classification: math.FA Mathematics Subject Classification: 46B04 Remarks: 8pages The source file(s), lmu09_05_05.tex: 23889 bytes, is(are) stored in gzipped form as 0905.1050.gz with size 7kb. The corresponding postcript file has gzipped size 66kb. Submitted from: hatori@math.sc.niigata-u.ac.jp The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/0905.1050 or http://arXiv.org/abs/0905.1050 or by email in unzipped form by transmitting an empty message with subject line uget 0905.1050 or in gzipped form by using subject line get 0905.1050 to: math@arXiv.org.