doc: add vrfwnetns keyword for zebra in doc

The option to enable VRF backend is documented.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

diff --git a/doc/zebra.8.in b/doc/zebra.8.in
index 7f4a81b1a0b2c55d86b54fc8edbc6c29340e99c8..3e1d10e068ac5e1eaaa9d747b1228c6ad474b5e8 100644 (file)
--- a/doc/zebra.8.in
+++ b/doc/zebra.8.in
@@ -92,6 +92,11 @@ maximum before starting zebra.
 
 Note that this affects Linux only.
 .TP
+\fB\-n\fR, \fB\-\-vrfwnetns \fR\fIEnable namespace VRF\fR
+Enable namespace VRF backend. By default, the VRF backend relies on VRF-lite
+support from Linux devices. This option permits discovering using Linux named
+Netns and map it to FRR VRF contexts.
+.TP
 \fB\-M\fR, \fB\-\-module \fR\fImodule:options\fR
 Load a module at startup.  May be specified more than once.
 The \fBsnmp\fR and \fBfpm\fR modules may be