Signed-off-by: Ben Pfaff <b...@nicira.com>
---
 FAQ |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/FAQ b/FAQ
index 75d9e6b..dac8fe1 100644
--- a/FAQ
+++ b/FAQ
@@ -1454,6 +1454,23 @@ A: These flows drop the ARP packets that IP hosts use to 
establish IP
       priority=5,in_port=1,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00,actions=2
       priority=5,in_port=2,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00,actions=1
 
+
+Development
+-----------
+
+Q: How do I implement a new OpenFlow message?
+
+A: Add your new message to "enum ofpraw" and "enum ofptype" in
+   lib/ofp-msgs.h, following the existing pattern, then recompile and
+   fix all of the new warnings.  (If you configure with
+   --enable-Werror, as described in INSTALL, then it is impossible to
+   miss any warnings.)
+
+   If you need to add an OpenFlow vendor extension message for a
+   vendor that doesn't yet have any extension messages, then you will
+   also need to edit build-aux/extract-ofp-msgs.
+
+
 Contact 
 -------
 
-- 
1.7.10.4

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