svnadmin setlog — Set the log-message on a revision.
Set the log-message on revision REVISION to the contents of FILE.
This is similar to using svn propset
--revprop to set the svn:log property
on a revision, except that you can also use the option
--bypass-hooks to avoid running any pre- or
post-commit hooks, which is useful if the modification of
revision properties has not been enabled in the pre-revprop-change
hook.
Revision properties are not under version control, so this command will permanently overwrite the previous log message.