diff --git a/init/do_mounts.c b/init/do_mounts.c
index 82f22885c87e995c3d18f6a0080bf639d99d9331..9b3565c41502af7bd9198f9a378c3a5cc7562423 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -182,7 +182,8 @@ static dev_t devt_from_partuuid(const char *uuid_str)
 /*
  *	Convert a name into device number.  We accept the following variants:
  *
- *	1) device number in hexadecimal	represents itself
+ *	1) <hex_major><hex_minor> device number in hexadecimal represents itself
+ *         no leading 0x, for example b302.
  *	2) /dev/nfs represents Root_NFS (0xff)
  *	3) /dev/<disk_name> represents the device number of disk
  *	4) /dev/<disk_name><decimal> represents the device number