diff --git a/HISTORY b/HISTORY
index e934d9ad22..c8c4ebd210 100644
--- a/HISTORY
+++ b/HISTORY
@@ -65,7 +65,8 @@ Overview
 Migration to version 7.3
 
    A dump/restore using "pg_dump" is required for those wishing to migrate
-   data from any previous release.
+   data from any previous release.  A summary of changes needed in client
+   applications is at http://www.ca.postgresql.org/docs/momjian/upgrade_7.3.
 
    Observe the following incompatibilities: