From: Luca Boccassi <>

We have many stable branches being maintained at the same time, and
sometimes it's not clear which branch a patch is being backported for.
Note in the guidelines that it should be specified via the cover letter,
annotation or using --subject-prefix.
Also note to send only to, not

Signed-off-by: Luca Boccassi <>
v3: break long lines, fix subject-prefix argument to include PATH

v2: hint that --subject-prefix is required, fix typos

 doc/guides/contributing/patches.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/doc/guides/contributing/patches.rst 
index 2287835f9..c077e341a 100644
--- a/doc/guides/contributing/patches.rst
+++ b/doc/guides/contributing/patches.rst
@@ -450,6 +450,18 @@ Experienced committers may send patches directly with 
``git send-email`` without
 The options ``--annotate`` and ``confirm = always`` are recommended for 
checking patches before sending.
+Backporting patches for Stable Releases
+Sometimes a maintainer or contributor wishes, or can be asked, to send a patch 
for a stable release
+rather than mainline. In this case the patch(es) should be sent to 
+not to ````.
+Given that there are multiple stable releases being maintained at the same 
time, please specify
+exactly which branch(es) the patch is for using ``git send-email 
--subject-prefix='PATCH 16.11' ...``
+and also optionally in the cover letter or in the annotation.
 The Review Process

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