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diff --git a/KMM.wiki b/KMM.wiki
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--- a/KMM.wiki
+++ b/KMM.wiki
@@ -22,6 +22,7 @@ https://docs.isy.liu.se/pub/VanHeden/DataSheets/atmega1284p.pdf
 == LibC ==
 - https://www.nongnu.org/avr-libc/user-manual/
 - [[http://www.nongnu.org/avr-libc/user-manual/group__util__delay.html|Advancerad busy wait]]
+- http://docs.w3cub.com/gcc~7/avr-function-attributes/
 
 
 === Hur programmerar man ===