Added third buffer arg expanation

git-svn-id: http://svn.osgeo.org/postgis/trunk@996 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/postgis.xml b/doc/postgis.xml
index b07504ab0d5624b883715a48bb4a468dc197e968..f9300fdb3445bce4fb3a674422e01a7bf37a31c6 100644 (file)
--- a/doc/postgis.xml
+++ b/doc/postgis.xml
@@ -2651,13 +2651,15 @@ if( geom.getType() = Geometry.POLYGON )
           </varlistentry>
 
           <varlistentry>
-            <term>Buffer(geometry,double)</term>
+            <term>Buffer(geometry,double,[integer])</term>
 
             <listitem>
               <para>Returns a geometry that represents all points whose
               distance from this Geometry is less than or equal to distance.
               Calculations are in the Spatial Reference System of this
-              Geometry.</para>
+              Geometry. The optional third parameter sets the
+             number of segment used to approximate a quarter circle
+             (defaults to 8).</para>
 
               <para>Performed by the GEOS module</para>