Documentation update.

diff --git a/doc/bird.sgml b/doc/bird.sgml
index 01e70e8283ad7add20a4209fb1ef525b12974373..fbda9f49cab314922b64af33b5feaeb0b484c4eb 100644 (file)
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -753,8 +753,10 @@ incompatible with each other (that is to prevent you from shooting in the foot).
          sets.
          For pair sets, expressions like <cf/(123,*)/ can be used to denote ranges (in
          that case <cf/(123,0)..(123,65535)/). You can also use <cf/(123,5..100)/ for range
-         <cf/(123,5)..(123,100)/. You can also use <cf/(*,123)/ which is translated as
-         <cf/(0,123) , (1,123) , (2,123) , ... , (65535, 123)/
+         <cf/(123,5)..(123,100)/. You can also use <cf/*/ and <cf/a..b/ expressions
+         in the first part of a pair, note that such expressions are translated to a set
+         of intervals, which may be memory intensive. E.g. <cf/(*,4..20)/ is translated to
+         <cf/(0,4..20), (1,4..20), (2,4..20), ... (65535, 4..20)/.
          You can also use expressions for both, pair sets and int sets. However it must
          be possible to evaluate these expressions before daemon boots. So you can use
          only constants inside them. E.g.
@@ -763,8 +765,8 @@ incompatible with each other (that is to prevent you from shooting in the foot).
         int set odds;
         pair set ps;
 
-        odds = [ one, (2+1), (6-one), (2*2*2-1), 9, 11 ]; 
-        ps = [ (1,(one+one)), (3,4)..(4,8), (5,*), (6,3..6) ];
+        odds = [ one, (2+1), (6-one), (2*2*2-1), 9, 11 ];
+        ps = [ (1,one+one), (3,4)..(4,8), (5,*), (6,3..6), (7..9,*) ];
        </code>
 
          Sets of prefixes are special: their literals does not allow ranges, but allows