Doc: Update prefix set comment

diff --git a/doc/bird.sgml b/doc/bird.sgml
index b965da87828c18727a43b64b5a9f745091122f88..1c60e619c6864f5f7ebe873b32a7b6f6211b6b68 100644 (file)
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -1419,9 +1419,10 @@ in the foot).
        <cf>192.168.0.0/16{16,24}</cf> and <cf>192.168.0.0/16 ge 24</cf> as
        <cf>192.168.0.0/16{24,32}</cf>.
 
-       It is possible to mix IPv4 and IPv6 prefixes/addresses in a prefix/ip set
-       but its behavior may change between versions without any warning; don't do
-       it unless you are more than sure what you are doing. (Really, don't do it.)
+       It is not possible to mix IPv4 and IPv6 prefixes in a prefix set. It is
+       currently possible to mix IPv4 and IPv6 addresses in an ip set, but that
+       behavior may change between versions without any warning; don't do it
+       unless you are more than sure what you are doing. (Really, don't do it.)
 
        <tag><label id="type-enum">enum</tag>
        Enumeration types are fixed sets of possibilities. You can't define your