Update EXPLAIN wording for GEQO usage.

diff --git a/doc/src/sgml/ref/explain.sgml b/doc/src/sgml/ref/explain.sgml
index 748e7e16ae2b0a5a6b8e7212f49c23dc627a26a7..a9da7a19f51ce76c9882d1ad807d45fcc4253118 100644 (file)
--- a/doc/src/sgml/ref/explain.sgml
+++ b/doc/src/sgml/ref/explain.sgml
@@ -1,5 +1,5 @@
 
 
@@ -151,11 +151,13 @@ ROLLBACK;
   
 
   
-   Prior to PostgreSQL 7.3, the plan was
-   emitted in the form of a NOTICE message.  Now it
-   appears as a query result (formatted like a table with a single
-   text column).
+   Genetic query optimization (GEQO) randomly 
+   tests execution plans.  Therefore, when the number of tables exceeds
+   geqo_threshold causing genetic query optimization to be 
+   used, the execution plan is likely to change each time the statement
+   is executed.
   
+