doc: Document a existing cli for zebra that was missing

The -s or --nl-bufsize option was missing, document it.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

diff --git a/doc/user/zebra.rst b/doc/user/zebra.rst
index 7ca473ceb657416dcb9fedb0e1318e84fc0ddaee..058987acf10e1d1694759acf13ff69e210bb4e50 100644 (file)
--- a/doc/user/zebra.rst
+++ b/doc/user/zebra.rst
@@ -78,6 +78,11 @@ Besides the common invocation options (:ref:`common-invocation-options`), the
    protocols about route installation/update on ack received from
    the linux kernel or from offload notification.
 
+.. option:: -s <SIZE>, --nl-bufsize <SIZE>
+
+   Allow zebra to modify the default receive buffer size to SIZE
+   in bytes.  Under *BSD only the -s option is available.
+
 .. _interface-commands:
 
 Configuration Addresses behaviour