Changes in A901 1.21 (rel. to 1.2)
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+ Any fenestration having a slope of less than 60 degrees from the horizontal is now considered a skylight and will be available in the skylights tab.
+ The opaque parts of a skylight get the same U-value as the fenestration part of the skylight.

Fixed bugs
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+ Fixed a bug in reporting wall areas in the "Shading and Fenestration" tab.
+ Fixed a bug where the skylight fenestration type in the baseline wasn't in line with tables 5.5-1 to 5.5-8.