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Update readme.rst (#5092)

Document additional build flag needed to support WPS under 2.4.2
This commit is contained in:
David Albert 2018-08-30 12:24:52 -04:00 committed by Develo
parent a917ad9941
commit 3164af0f35

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@ -65,6 +65,8 @@ required to enable it:
`Read more <a05-board-generator.rst>`__.
For platformIO (and maybe other build environments), you will also need to add the build flag: -D NO_EXTRA_4K_HEAP
This manual selection is not needed starting from 2.5.0 (and in git
version). WPS is always available, and not using it will give an extra
~4.5KB compared to releases until 2.4.1 included.