doc: Use +/- for `set local-preference` to add/subtract the value

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

diff --git a/doc/user/routemap.rst b/doc/user/routemap.rst
index 435639c291f711f18d9be600fa03ad5f42a34527..3b7bd7de142072d041725c142c3bfce2279301ed 100644 (file)
--- a/doc/user/routemap.rst
+++ b/doc/user/routemap.rst
@@ -273,6 +273,16 @@ Route Map Set Command
 
    Set the BGP local preference to `local_pref`.
 
+.. index:: set local-preference +LOCAL_PREF
+.. clicmd:: set local-preference +LOCAL_PREF
+
+   Add the BGP local preference to an existing `local_pref`.
+
+.. index:: set local-preference -LOCAL_PREF
+.. clicmd:: set local-preference -LOCAL_PREF
+
+   Subtract the BGP local preference from an existing `local_pref`.
+
 .. index:: [no] set distance DISTANCE
 .. clicmd:: [no] set distance DISTANCE