Free DSP All-in-one Arduino connector

Hi,
By reading the documentation on the FreeDSP All-in-one board, I see the pinout of the Arduino connector, fig.22:
Capture.JPG

I am familiar with the Arduino boards, and unless I miss something, I know all these pins except "WP" : the I2C bus (SDA,SCL), +5V, GND, are known, Reset can probably be picked up somewhere on the Arduino, but what is the WP pin ?

Thanks