doc: Say that maximum-prefix-out requires it's own update-group

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>

diff --git a/doc/user/bgp.rst b/doc/user/bgp.rst
index 4a5bdc2428af17efc49c79319298161529ceb975..064bc39265546b024614734282ab2cb248c2bfb9 100644 (file)
--- a/doc/user/bgp.rst
+++ b/doc/user/bgp.rst
@@ -1216,7 +1216,7 @@ Defining Peers
    The time in milliseconds that BGP will delay before deciding what peers
    can be put into an update-group together in order to generate a single
    update for them.  The default time is 1000.
-   
+
 .. _bgp-configuring-peers:
 
 Configuring Peers
@@ -1353,6 +1353,9 @@ Configuring Peers
 
    Sets a maximum number of prefixes we can send to a given peer.
 
+   Since sent prefix count is managed by update-groups, this option
+   creates a separate update-group for outgoing updates.
+
 .. index:: [no] neighbor PEER local-as AS-NUMBER [no-prepend] [replace-as]
 .. clicmd:: [no] neighbor PEER local-as AS-NUMBER [no-prepend] [replace-as]