--- a/dovecot-example.conf	Fri Jul 22 20:07:04 2005 +0300
+++ b/dovecot-example.conf	Fri Jul 22 20:09:42 2005 +0300
@@ -577,7 +577,12 @@
   # so it can't be used as userdb. If you don't want to use a separate user
   # database (passwd usually), you can use static userdb.
   passdb pam {
-    # Service name or * as parameter. * means the authenticating service name
+    # [-session] [<service name>]
+    #
+    # -session makes Dovecot open and immediately close PAM session. Some
+    # PAM plugins need this to work.
+    # 
+    # If service name is "*", it means the authenticating service name
     # is used, eg. pop3 or imap.
     #args = dovecot
   }