diff --git a/firmware/README b/firmware/README
index dc28f30..5c25948 100644
--- a/firmware/README
+++ b/firmware/README
@@ -12,7 +12,7 @@ Firmware features:
 * 100Hz frame refresh rate.
 * The EEPROM contains 32 frames. Every frame will be displayed.
 * Every frame has it's own lifetime. This is the delay between two bordering frames.
-* Hid conform USB 1.1 device with vendor id 16c0 and product id 05df.
+* Hid conform USB 1.1 device with vendor id 16c0 and device id 05df.
 * 3 firmware modes are adjustable via USB.
     MODE_ANIMATION_STOP   - Animation stopped. Single frames can be shown until
                             it will be overwritten.