From 5b9e019d95a7d95e53c6a4ca789ccd5b73b0e94f Mon Sep 17 00:00:00 2001
From: Sandro Santilli <strk@keybit.net>
Date: Thu, 8 Dec 2011 13:35:31 +0000
Subject: [PATCH] Add a note about ST_Estimated_Extent on empty or non-analyzed
 tables (#877)

git-svn-id: http://svn.osgeo.org/postgis/trunk@8321 b70326c6-7e19-0410-871a-916f4a2858ee
---
 doc/reference_misc.xml | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/doc/reference_misc.xml b/doc/reference_misc.xml
index a23759f70..893e06049 100644
--- a/doc/reference_misc.xml
+++ b/doc/reference_misc.xml
@@ -201,9 +201,20 @@ all_em|grabone   | grab_rest
 		ANALYZE and resulting extent will be about 95% of the real
 		one.</para>
 
+                <note>
+                <para>
+In absence of statistics (empty table or no ANALYZE called) this function
+returns NULL.  Prior to version 1.5.4 an exception was thrown
+instead.
+		</para>
+                </note>
+
+
 		<para>For PostgreSQL&lt;8.0.0 statistics are gathered by
 		update_geometry_stats() and resulting extent will be exact.</para>
 
+                <para>Availability: 1.0.0</para>
+
 		<para>&curve_support;</para>
 	  </refsection>
 
-- 
2.40.0