diff --git a/doc/mgmt-api.txt b/doc/mgmt-api.txt
index caba22d..87982e0 100644
--- a/doc/mgmt-api.txt
+++ b/doc/mgmt-api.txt
@@ -2504,6 +2504,9 @@ Read Advertising Features Command
 		4	Add TX Power field to Adv_Data
 		5	Add Appearance field to Scan_Rsp
 		6	Add Local Name in Scan_Rsp
+		7	Secondary Channel with LE 1M
+		8	Secondary Channel with LE 2M
+		9	Secondary Channel with LE Coded
 
 	The Flags bit 0 indicates support for connectable advertising
 	and for switching to connectable advertising independent of the
@@ -2553,6 +2556,15 @@ Read Advertising Features Command
 	space is limited a short version or no name information. The
 	Local Name will be added at the end of the scan response data.
 
+	The Flags bit 7 indicates support for advertising in secondary
+	channel in LE 1M PHY.
+
+	The Flags bit 8 indicates support for advertising in secondary
+	channel in LE 2M PHY. Primary channel would be on 1M.
+
+	The Flags bit 9 indicates support for advertising in secondary
+	channel in LE CODED PHY.
+
 	The valid range for Instance identifiers is 1-254. The value 0
 	is reserved for internal use and the value 255 is reserved for
 	future extensions. However the Max_Instances value for indicating
@@ -2613,6 +2625,9 @@ Add Advertising Command
 		4	Add TX Power field to Adv_Data
 		5	Add Appearance field to Scan_Rsp
 		6	Add Local Name in Scan_Rsp
+		7	Secondary Channel with LE 1M
+		8	Secondary Channel with LE 2M
+		9	Secondary Channel with LE Coded
 
 	When the connectable flag is set, then the controller will use
 	undirected connectable advertising. The value of the connectable
@@ -2640,6 +2655,16 @@ Add Advertising Command
 	supported to provide less air traffic for devices implementing
 	broadcaster role.
 
+	Secondary channel flags can be used to advertise in secondary
+	channel with the corresponding PHYs. These flag bits are mutually
+	exclusive and setting multiple will result in Invalid Parameter
+	error. Choosing either LE 1M or LE 2M will result in using
+	extended advertising on the primary channel with LE 1M and the
+	respectively LE 1M or LE 2M on the secondary channel. Choosing
+	LE Coded will result in using extended advertising on the primary
+	and secondary channels with LE Coded. Choosing none of these flags
+	will result in legacy advertising.
+
 	The Duration parameter configures the length of an Instance. The
 	value is in seconds.