SubmittingPatches: tighten wording on "sign-off" procedure

gitster · gitster · commit 0454986e7811 · 2021-01-07T15:41:36.000-08:00
The text says "if you can certify DCO then you add a Signed-off-by
trailer".  But it does not say anything about people who cannot or
do not want to certify.  A natural reading may be that if you do not
certify, you must not add the trailer, but it shouldn't hurt to be
overly explicit.

Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/Documentation/SubmittingPatches b/Documentation/SubmittingPatches
@@ -307,7 +307,7 @@ wrote the patch or have the right to pass it on under the same license
 as ours, by "signing off" your patch.  Without sign-off, we cannot
 accept your patches.
 
-If you can certify the below D-C-O:
+If (and only if) you certify the below D-C-O:
 
 [[dco]]
 .Developer's Certificate of Origin 1.1
