range-diff doc: add a section about output stability

diff --git a/Documentation/git-send-email.txt b/Documentation/git-send-email.txt
index 385c7de9e2b936007e6a9a4626f40373f24f88de..465a4ecbeddaa20189bce6e223df8bbfa0319b9a 100644 (file)
--- a/Documentation/git-send-email.txt
+++ b/Documentation/git-send-email.txt
@@ -147,8 +147,7 @@ Note that no attempts whatsoever are made to validate the encoding.
        otherwise.
 +
 Default is the value of the `sendemail.transferEncoding` configuration
-value; if that is unspecified, git will use 8bit and not add a
-Content-Transfer-Encoding header.
+value; if that is unspecified, default to `auto`.
 
 --xmailer::
 --no-xmailer::
@@ -401,8 +400,11 @@ have been specified, in which case default to 'compose'.
 +
 --
                *       Invoke the sendemail-validate hook if present (see linkgit:githooks[5]).
-               *       Warn of patches that contain lines longer than 998 characters; this
-                       is due to SMTP limits as described by http://www.ietf.org/rfc/rfc2821.txt.
+               *       Warn of patches that contain lines longer than
+                       998 characters unless a suitable transfer encoding
+                       ('auto', 'base64', or 'quoted-printable') is used;
+                       this is due to SMTP limits as described by
+                       http://www.ietf.org/rfc/rfc5322.txt.
 --
 +
 Default is the value of `sendemail.validate`; if this is not set,