diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index bea1e9a0388e4af20d094b01c5f65cbce1a9262f..98271503f0063c0d8b5e63276ac30a30e6f0aef2 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -5,6 +5,7 @@ using them to avoid name-space collisions.
 
 ad	Avionic Design GmbH
 adi	Analog Devices, Inc.
+ak	Asahi Kasei Corp.
 amcc	Applied Micro Circuits Corporation (APM, formally AMCC)
 apm	Applied Micro Circuits Corporation (APM)
 arm	ARM Ltd.