Index: doc/src/sgml/indices.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/indices.sgml,v
retrieving revision 1.55
diff -u -r1.55 indices.sgml
--- doc/src/sgml/indices.sgml	7 Nov 2005 17:36:44 -0000	1.55
+++ doc/src/sgml/indices.sgml	22 Nov 2005 00:30:55 -0000
@@ -525,6 +525,16 @@
    feature, but there are several situations in which they are useful.
   </para>
 
+  <note>
+   <para>
+    Predicate indexes on bigint (<xref linkend="datatype-int">) columns will
+    not be used unless they are casted:
+<programlisting>
+CREATE INDEX foo ON test_key (id) WHERE id >= 50000::bigint;
+</programlisting>
+   </para>
+  </note>
+
   <para>
    One major reason for using a partial index is to avoid indexing common
    values.  Since a query searching for a common value (one that