[qiushihe]

The first sentence of the article:

> Activity Monitor is a tool that was introduced in Mac OS X 10.9.

Activity Monitor was introduced with OS X 10.3 (https://en.wikipedia.org/wiki/Activity_Monitor). And was significantly revamped with OS X 10.9 to receive the various energy related measurements.

[nnethercote]

I'm the author of the post. You're right. I corrected the first paragraph.

Thank you for the suggestion.