diff --git a/libburn/libburn.h b/libburn/libburn.h
index 32a4bb3..aee20e9 100644
--- a/libburn/libburn.h
+++ b/libburn/libburn.h
@@ -404,10 +404,13 @@ void burn_set_verbosity(int level);
     after burn_initialize() and before any bus scan. But not mandatory at all.
     Parameter value 1 enables a feature, 0 disables.  
     Default is (1,0,0). Have a good reason before you change it.
-    @param exclusive Try to open only devices which are not marked as busy
+    @param exclusive 1 = Try to open only devices which are not marked as busy
                      and try to mark them busy if opened sucessfully. (O_EXCL)
                      There are kernels which simply don't care about O_EXCL.
                      Some have it off, some have it on, some are switchable.
+                     2 = in case of a SCSI device, also try to open exclusively
+                     the matching /dev/sr, /dev/scd and /dev/st .
+                     0 = no attempt to make drive access exclusive.
     @param blocking  Try to wait for drives which do not open immediately but
                      also do not return an error as well. (O_NONBLOCK)
                      This might stall indefinitely with /dev/hdX hard disks.