more on transient.

didn't get it rigth the first time.
Thanks to scoof for pointing it out.

doc/sphinx/reference/varnishd.rst

@@ -87,9 +87,11 @@ OPTIONS
 
 -S file     Path to a file containing a secret used for authorizing access to the management port.
 
--s type[,options]
+-s [name=]type[,options]
             Use the specified storage backend.  See Storage Types for a list of supported storage
-            types.  This option can be used multiple times to specify multiple storage files.
+            types.  This option can be used multiple times to specify multiple storage files. You
+ 	    can name the different backends. Varnish will then reference that backend with the 
+	    given name in logs, statistics, etc.
 
 -T address[:port]
             Offer a management interface on the specified address and port.  See Management
@@ -232,10 +234,12 @@ persistent,path,size {experimental}
       *sealed*. When Varnish starts after a shutdown it will discard
       the content of any silo that isn't sealed.
 
-Transient[,size]
-      Storage for transient (short lived) objects. By default this is
-      unlimited. This storage backend behaves just like the malloc backend and takes the same options.
-
+Transient Storage
+-----------------
+      
+      If you name any of your storage backend "Transient" it will be
+      used for transient (short lived) objects. By default Varnish
+      would use an unlimited malloc backend for this.
 
 Management Interface
 --------------------