manual: contributing: Mention range-diff

Message-Id: <20210206180630.3676-3-kyle@kyleam.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/piem.texi b/piem.texi
index ecd17e6..bb5c684 100644
--- a/piem.texi
+++ b/piem.texi
@@ -483,6 +483,13 @@ format-patch} or by configuring @code{format.useAutoBase}.
 In general, prefer to keep iterations of a patch series in the same
 thread, labeling rerolls with an appropriate version.
 
+@item Consider adding a range-diff to the cover letter of rerolls.
+
+For a multi-patch series, @code{git range-diff} can often provide a nice
+overview of the changes between the previous and last iteration.  Note
+that @code{git format-patch} has a @code{--range-diff} convenience
+option.
+
 @end itemize