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-rw-r--r--doc/user/bgp.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/user/bgp.rst b/doc/user/bgp.rst
index 6504e7d206..7a508b0df6 100644
--- a/doc/user/bgp.rst
+++ b/doc/user/bgp.rst
@@ -29,7 +29,8 @@ be specified (:ref:`common-invocation-options`).
.. option:: -p <port>
.. option:: --bgp_port <port>
- Set the bgp protocol's port number.
+ Set the bgp protocol's port number. When port number is 0, that means do not
+ listen bgp port.
.. option:: -r
.. option:: --retain