Adobe Photoshop CC 2014 v.14.xx - Manual (Page 353)

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9. To erase recently drawn segments and fastening points, press the Delete key until you’ve erased the fastening points for the desired
segment.
10. Close the selection border:
To close the border with a magnetic segment, double-click, or press Enter or Return. (To manually close the border, drag over the
starting point and click.)
To close the border with a straight segment, hold down Alt (Windows) or Option (Mac OS), and double-click.
11. (Optional) Click Refine Edge to further adjust the selection boundary. See Refine selection edges .
More Help Topics
Saving selections and alpha channel masks
Convert paths to selection borders
Selection tools gallery
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