[PATCH v4 3/6] docs/devel: add b4 for patch retrieval

[Pierrick Bouvier]

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 docs/devel/submitting-a-patch.rst | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/docs/devel/submitting-a-patch.rst 
b/docs/devel/submitting-a-patch.rst
index 69df7682c5e..65c64078cb3 100644
--- a/docs/devel/submitting-a-patch.rst
+++ b/docs/devel/submitting-a-patch.rst
@@ -433,6 +433,20 @@ For more details on how QEMU's stable process works, refer 
to the
 
 .. _participating_in_code_review:
 
+Retrieve an existing series
+---------------------------
+
+If you want to apply an existing series on top of your tree, you can simply use
+`b4 <https://github.com/mricon/b4>`__.
+
+::
+
+    b4 shazam $msg-id
+
+The message id is related to the patch series that has been sent to the mailing
+list. You need to retrieve the "Message-Id:" header from one of the patches. 
Any
+of them can be used and b4 will apply the whole series.
+
 Participating in Code Review
 ----------------------------
 
-- 
2.39.5