diff --git a/Documentation/sound/alsa/HD-Audio-Models.txt b/Documentation/sound/alsa/HD-Audio-Models.txt
index 5efacf01d9e3297633e8d21088a3ca0d2d4dca35..1d38b0dfba95f6138038716f215991c0f7fd6be9 100644
--- a/Documentation/sound/alsa/HD-Audio-Models.txt
+++ b/Documentation/sound/alsa/HD-Audio-Models.txt
@@ -125,6 +125,7 @@ ALC882/883/885/888/889
   macpro	MacPro support
   mb5		Macbook 5,1
   macmini3	Macmini 3,1
+  mba21		Macbook Air 2,1
   mbp3		Macbook Pro rev3
   imac24	iMac 24'' with jack detection
   imac91	iMac 9,1