diff --git a/xorriso/README b/xorriso/README
index 9b76343a..25a55cfd 100644
--- a/xorriso/README
+++ b/xorriso/README
@@ -123,9 +123,13 @@ Better try to unmount an eventually mounted media before a write run.
 
 
 Besides true optical drives, xorriso can also address disk files as input or
-output drives. The addresses of the disk files have to be preceded by "stdio:".
+output drives. By default paths to files under /dev are accepted only if the
+device represents a real optical drive. Other device files may be addressed
+by prepending "stdio:" to the path.
 Like:
-    xorriso -dev stdio:/tmp/pseudo_drive ...more arguments...
+    xorriso -dev stdio:/dev/sdb ...more arguments...
+This rule may be changed by xorriso option -drive_class.
+Prefix "mmc:" causes a path to be accepted only if it is a real optical drive.
 
 
                               Testing
diff --git a/xorriso/xorriso_eng.html b/xorriso/xorriso_eng.html
index 3a6a9022..cbeaba34 100644
--- a/xorriso/xorriso_eng.html
+++ b/xorriso/xorriso_eng.html
@@ -443,6 +443,8 @@ Enhancements towards previous stable version xorriso-0.2.8.pl01:
 <LI>New options -mount, -mount_cmd, -session_string</LI>
 <LI>By using libburn-0.5.9: support for BD-R media</LI>
 <LI>New -format modes by_size_ and fast_by_size_</LI>
+<LI>New option -assert_volid</LI>
+<LI>New option -drive_class for safety management of pseudo-drive access</LI>
 <!-- 
 <LI>- none yet -</LI>
  -->