--- pt-online-schema-change~	2012-04-03 21:51:54.000000000 +0200
+++ pt-online-schema-change	2012-08-13 19:30:01.615155625 +0200
@@ -7316,6 +7316,14 @@
 
 Show version and exit.
 
+=item --where
+
+type: string
+
+Where statement that restict which rows are copied to the new table.
+Note that this statement doesn't affect the rows added to the table
+during the process.
+
 =back
 
 =head1 DSN OPTIONS