diff --git a/android/hal-ipc-api.txt b/android/hal-ipc-api.txt
index ffc903a..9021154 100644
--- a/android/hal-ipc-api.txt
+++ b/android/hal-ipc-api.txt
@@ -1461,6 +1461,13 @@ Android HAL name: "gatt" (BT_PROFILE_GATT_ID)
 		In case of an error, the error response will be returned.
 
 	Opcode 0x06 - Listen command/response
+
+		Command parameters: Client Interface (4 octets)
+		                    Start (1 octet)
+		Response parameters: <none>
+
+		In case of an error, the error response will be returned.
+
 	Opcode 0x07 - Refresh command/response
 	Opcode 0x08 - Search Service command/response
 	Opcode 0x09 - Get Included Service command/response
diff --git a/android/hal-msg.h b/android/hal-msg.h
index fd1fd61..fd60bfd 100644
--- a/android/hal-msg.h
+++ b/android/hal-msg.h
@@ -548,6 +548,12 @@ struct hal_cmd_gatt_client_disconnect {
 	int32_t conn_id;
 } __attribute__((packed));
 
+#define HAL_OP_GATT_CLIENT_LISTEN		0x06
+struct hal_cmd_gatt_client_listen {
+	int32_t client_if;
+	uint8_t start;
+} __attribute__((packed));
+
 /* Notifications and confirmations */
 
 #define HAL_POWER_OFF			0x00