Misc: phantom, add comment about openhaptics

Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/misc/phantom.c

@@ -9,6 +9,7 @@
  *  You need an userspace library to cooperate with this driver. It (and other
  *  info) may be obtained here:
  *  http://www.fi.muni.cz/~xslaby/phantom.html
+ *  or alternatively, you might use OpenHaptics provided by Sensable.
  */
 
 #include <linux/kernel.h>