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@@ -12,4 +12,12 @@ https://www.nongnu.org/avr-libc/user-manual/group__avr__power.html
 
 ### Others
 On ulatra strange behavior remember gcc optimizations gan fuck with your code. See Flags: -Os <--- does for example remove empty while loops, which can be crusial for embedded devices.
-In that case use something like -O0 if possible(because of flash size).
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+In that case use something like -O0 if possible(because of flash size).
+
+#### Disable Clk prescaler
+
+1. set presclaer fuses
+
+2.`clock_prescale_set(x)`
+
+https://www.mikrocontroller.net/topic/291951
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