SVN: ZODB/trunk/README.txt Updated compatibility notes.

Log message for revision 111151:
  Updated compatibility notes.
  

Changed:
  U   ZODB/trunk/README.txt

-=-
Modified: ZODB/trunk/README.txt
===================================================================
--- ZODB/trunk/README.txt	2010-04-19 21:57:19 UTC (rev 111150)
+++ ZODB/trunk/README.txt	2010-04-19 22:03:53 UTC (rev 111151)
@@ -24,11 +24,21 @@
 Compatibility
 =============
 
-ZODB 3.9 requires Python 2.4.2 or later.
+ZODB 3.10 requires Python 2.5 or later.
 
-ZODB ZEO clients from ZODB 3.2 on can talk to ZODB 3.9 servers.  ZODB
-ZEO Clients can talk to ZODB 3.8 and 3.9 ZEO servers.
+Note --
+   When using ZEO and upgrading from Python 2.4, you need to upgrade
+   clients and servers at the same time, or upgrade clients first and
+   then servers.  Clients running Python 2.4 won't work properly with
+   servers running Python 2.5 or later dur to changes in the way
+   Python implements exceptions.
 
+ZODB ZEO clients from ZODB 3.2 on can talk to ZODB 3.10 servers.  ZODB
+ZEO 3.10 Clients can talk to ZODB 3.8, 3.9, and 3.10 ZEO servers.
+
+Note --
+   ZEO 3.10 servers don't support undo for older clients.
+
 Prerequisites
 =============