diff --git a/zconf/css/lscss.8 b/zconf/css/lscss.8
index f6a8fbb2..9a214381 100644
--- a/zconf/css/lscss.8
+++ b/zconf/css/lscss.8
@@ -111,6 +111,10 @@ In rare situations a device might temporarily not be accessible to
 the subchannel. Then "none" is displayed as the device identifier and the
 other device attributes are empty.
 
+For subchannels bound to an alternate driver (most notably vfio_ccw) the
+device identifier may also be displayed as "none". In this case use the
+\fB--vfio\fR option to show VFIO specific subchannel information.
+
 .SH AUTHOR
 .nf
 This man-page was written by Stefan Bader <shbader@de.ibm.com>.