kmsg - add Documentation/ABI/testing/dev-kmsg

Signed-off-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/Documentation/devices.txt b/Documentation/devices.txt
index 0038318..5941f51 100644
--- a/Documentation/devices.txt
+++ b/Documentation/devices.txt
@@ -98,7 +98,8 @@
 		  8 = /dev/random	Nondeterministic random number gen.
 		  9 = /dev/urandom	Faster, less secure random number gen.
 		 10 = /dev/aio		Asynchronous I/O notification interface
-		 11 = /dev/kmsg		Writes to this come out as printk's
+		 11 = /dev/kmsg		Writes to this come out as printk's, reads
+					export the buffered printk records.
 		 12 = /dev/oldmem	Used by crashdump kernels to access
 					the memory of the kernel that crashed.