@enumerate
@item
-Before making changes, a baseline should be established by
-running:
+Run @code{make} with current git master without any of your changes.
+
+@item
+Before making changes to the code, establish a baseline for the comparison by
+going to the @file{lilypond-git/build/} directory and running:
@example
make test-baseline
@end example
After this has finished, a regression test comparison will be
-available at:
+available (relative to the current @file{build/} directory) at:
@example
out/test-results/index.html
@end enumerate
+@advanced{
+Once a test baseline has been established, there is no need to run it again
+unless git master changed. In other words, if you work with several branches
+and want to do regtests comparison for all of them, you can
+@code{make test-baseline} with git master, checkout some branch,
+@code{make} and @code{make check} it, then switch to another branch,
+@code{make} and @code{make check} it without doing @code{make test-baseline}
+again.}
+
@node Finding the cause of a regression
@section Finding the cause of a regression