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>