Indexes on Expressions - a note to remind users to run ANALYZE after creation

[Nikolay Samokhvalov]

diff --git a/doc/src/sgml/indices.sgml b/doc/src/sgml/indices.sgml
index 
671299ff059d972ff95bdb1d67ed4c89bf5040b2..c7eaf9a608e995ef9957b4e0f677b36a8303be55
100644
--- a/doc/src/sgml/indices.sgml
+++ b/doc/src/sgml/indices.sgml
@@ -741,6 +741,15 @@ CREATE INDEX people_names ON people ((first_name
|| ' ' || last_name));
    query.  Thus, indexes on expressions are useful when retrieval speed
    is more important than insertion and update speed.
   </para>
+
+  <note>
+   <title>Note</title>
+   <para>
+    Once an index on an expression is successfully created, it is important to
+    run <literal>ANALYZE</literal> on the corresponding table to gather
+    statistics for the expression.
+   </para>
+  </note>
  </sect1>



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