Better doc for local sync

smd-config.5.txt

@@ -111,11 +111,14 @@ PATHS EXCLUSION
 
 LOCAL SYNCHRONIZATION
 
-  If the local and remote mailboxes are on the same filesystem the following
+  If the local and remote mailboxes are on the same host the following
   option must be added to the configuration file:
 
   SMDCLIENTOPTS=-l
 
+  Note that this options has also the effect that ssh is not used. A a simple
+  pair of pipes is used instead.
+
 DELETIONS
 
   In some cases, usually unidirectional synchronizations, one may want