Mention version portability of pg_dump.

diff --git a/doc/src/sgml/ref/pg_dump.sgml b/doc/src/sgml/ref/pg_dump.sgml
index 9e076a43083050a016b532b956e09afd4f70f5a8..22540a12ae3129f0e8ba1a3767782663c3101def 100644 (file)
--- a/doc/src/sgml/ref/pg_dump.sgml
+++ b/doc/src/sgml/ref/pg_dump.sgml
@@ -1,5 +1,5 @@
 
 
@@ -645,6 +645,17 @@ CREATE DATABASE foo WITH TEMPLATE template0;
    ensure good performance.
   
 
+  
+   Because pg_dump is used to tranfer data
+   to newer versions of PostgreSQL, the output of
+   pg_dump can be loaded into
+   newer versions of PostgreSQL.  It also can read older
+   PostgreSQL databases.  However, it usually cannot
+   read newer PostgreSQL databases or produce dump output
+   that can be loaded into older database versions.  To do this, manual
+   editing of the dump file might be required.
+  
+