Bensdorp-s-Long-Mean-Reversion-Selloff-V2

I got this question:

QUOTE:
One question regarding your implementation of Bensdorp's System 3 Long Mean Reversion Selloff - he specifies a market-on-close order for taking profit, and you use a limit order. Why did you do that?

I checked the book, it clearly says:

QUOTE:
Profit taking: If profit is 4 percent or more based on the closing price, exit next day market on close.

I must have misread it -or- in the middle of the sentence I probably thought: "Wait, that makes no sense..." and got distracted....

the current implementation is more:

QUOTE:
Profit Taking: Place a limit order four percent above the entry price.

Would be interesting to see the difference in performance...