A normal 'blame' shows when (and by whom) each line was *last* changed *before* the version being annotated. Proposed enhancement: show when (and by whom) each line was *next* changed *after* the version being annotated. I seem to recall that the code-name 'kidney blame' came from Daniel Shahaf selecting a random word that is not already used to describe something in Subversion. Adjectives such as 'forward' and 'reverse' are ambiguous both in describing the meaning of the original blame, and because they are separately used in reference to the direction in which the blame code internally scans revisions, which is independent of the result it generates. This enhancement was discussed in the email thread "Kidney blame's behaviour and edge cases" starting on 2013-06-13, archived at e.g. http://mail-archives.apache.org/mod_mbox/subversion-dev/201306.mbox/%3C20130613083546.GA2773@tarsus.local2%3E and http://svn.haxx.se/dev/archive-2013-06/0230.shtml It was initially implemented in http://svn.apache.org/r1493027 .