diff --git a/README.md b/README.md
index 841289d..af1b00e 100644
--- a/README.md
+++ b/README.md
@@ -23,8 +23,8 @@
 
 # Howto build/install
 1. You will need to blacklist another driver in order to use this one.
-2. `echo "blacklist r8188eu" >> "/etc/modprobe.d/realtek.conf"`
-3. `make && make install`
+2. `echo 'blacklist r8188eu'|sudo tee -a '/etc/modprobe.d/realtek.conf'`
+3. `make && sudo make install`
 4. Reboot in order to blacklist and load the new driver/module.
 
 # MONITOR MODE howto
diff --git a/os_dep/linux/usb_intf.c b/os_dep/linux/usb_intf.c
index e3c2632..31e527a 100644
--- a/os_dep/linux/usb_intf.c
+++ b/os_dep/linux/usb_intf.c
@@ -158,6 +158,7 @@ static struct usb_device_id rtw_usb_id_tbl[] = {
 	{USB_DEVICE(0x2001, 0x330F), .driver_info = RTL8188E}, /* DLink DWA-125 REV D1 */ 
 	{USB_DEVICE(0x2001, 0x3310), .driver_info = RTL8188E}, /* Dlink DWA-123 REV D1 */ 
 	{USB_DEVICE(0x2001, 0x3311), .driver_info = RTL8188E}, /* DLink GO-USB-N150 REV B1 */ 
+	{USB_DEVICE(0x2001, 0x331B), .driver_info = RTL8188E}, /* DLink DWA-121 REV B1 */ 
 	{USB_DEVICE(0x056E, 0x4008), .driver_info = RTL8188E}, /* Elecom WDC-150SU2M */ 	
 #endif