Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
even if the eventual tree (and therefore commit) is the same.
Otherwise, after updating dgit, the cache might have the right answer
but not be refreshed even by a build.
+ * dgit(1): Document which --ch: options are a good idea.
--
.RI \fB--ch:\fR option
Specifies a single additional option to pass, eventually, to
dpkg-genchanges.
+
+Options which are safe to pass include
+.BR "-si -sa -sd -C" .
+
+For other options the caveat below applies.
.TP
.RI \fB--curl:\fR option " | \fB--dput:\fR" option " |..."
Specifies a single additional option to pass to