NodeMCU.md

@@ -40,10 +40,12 @@ The term "NodeMCU" by default refers to the firmware rather than the dev kits. T
 
 ### ESP8266 vs ATMega328 (Arduino UNO, Nano, Pro Mini)
 
-| | ESP8266 | ATMega328 |
+| | [ESP8266](https://en.wikipedia.org/wiki/ESP8266) | [ATMega328](https://en.wikipedia.org/wiki/ATmega328) |
 |---|---|---|
+|Manufacturer|[Espressif](https://espressif.com/)|[Atmel](http://www.atmel.com/)|
 |Architecture|32-bit [RISC](https://en.wikipedia.org/wiki/Reduced_instruction_set_computing)|8-bit AVR RISC|
-|Clock Speed|80-160 MHz|16 MHz|
+|Clock Speed|80 MHz|16 MHz|
+|Maximum operating frequency|160 MHz|20 MHz|
 |Flash Memory|External (512Kb-4MB)|Internal (32Kb)|
 |Connectivity|IEEE 802.11 b/g/n Wi-Fi|No|
 |Operating Voltage|3.3v|3.3v or 5v|