--- /tmp/dump.8	2009-01-09 13:07:26.000000000 -0400
+++ /tmp/dump.8	2009-02-12 21:52:03.000000000 -0400
@@ -136,9 +136,11 @@ 
 This will greatly improve performance
 at the cost of
 .Nm
-possibly not noticing changes in the file system between passes.
-It is
-recommended that you always use this option when dumping a snapshot.
+possibly not noticing changes in the file system between passes
+unless a snapshot is being used.
+The potential for performance improvement indicates that
+use of this option together with snapshots is the recommended
+course of action.
 Beware that
 .Nm
 forks, and the actual memory use may be larger than the specified cache