X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=udev.8;h=0a0640ad8c95d633e76cd2704f95d86077bc63ed;hb=a38401d3e89f9e66039a9708fd0af33eefab7210;hp=f2006c42dc60aef84065b69cab2ed65506660a5e;hpb=170ae44e7d45e5907668cd1eab740a84eb79c70a;p=elogind.git

diff --git a/udev.8 b/udev.8
index f2006c42d..0a0640ad8 100644
--- a/udev.8
+++ b/udev.8
@@ -106,7 +106,10 @@ The line format is:
 where valid methods with corresponding keys are:
 .TP
 .B CALLOUT
-calling external program, that returns a string to match
+calling external program, that returns a string to match.  The 
+.BR BUS 
+key is optional, but if specified, the sysfs device bus must be able to be
+detemined by a "device" symlink.
 .br
 .RB "keys: " BUS ", " PROGRAM ", " ID
 .TP