[PATCH] doc: environment: NET_LWIP dhcp sets ipaddrN, netmaskN and gatewayipN

[Jerome Forissier]

Document environment variables set by the dhcp command when the network
stack is lwIP.

Signed-off-by: Jerome Forissier <jerome.forissier at linaro.org>
---
 doc/usage/environment.rst | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/doc/usage/environment.rst b/doc/usage/environment.rst
index 7bd9ffce8d8..b67aae84c58 100644
--- a/doc/usage/environment.rst
+++ b/doc/usage/environment.rst
@@ -499,7 +499,7 @@ Automatically updated variables
 -------------------------------
 
 The following environment variables may be used and automatically
-updated by the network boot commands ("bootp" and "rarpboot"),
+updated by the network boot commands ("bootp", "dhcp" and "rarpboot"),
 depending the information provided by your boot server:
 
 =========  ===================================================
@@ -514,6 +514,9 @@ ipaddr     See above
 netmask    Subnet Mask
 rootpath   Pathname of the root filesystem on the NFS server
 serverip   see above
+ipaddrN    IP address for interface N (>0) (NET_LWIP dhcp only)
+netmaskN   Subnet mask for interface N (>0) (NET_LWIP dhcp only)
+gatewayipN IP address of the Gateway for interface N (>0) (NET_LWIP dhcp only)
 =========  ===================================================
 
 
-- 
2.43.0