diff --git a/doc/mgmt-api.txt b/doc/mgmt-api.txt
index f600ab9..39f23c4 100644
--- a/doc/mgmt-api.txt
+++ b/doc/mgmt-api.txt
@@ -2480,6 +2480,7 @@ Read Extended Controller Index List Command
 		0x07	SPI
 		0x08	I2C
 		0x09	SMD
+		0x0A	VIRTIO
 
 	Controllers marked as RAW only operation are currently not listed
 	by this command.