diff --git a/avr/common/utils_wait.asm b/avr/common/utils_wait.asm
index 0d664e7..095d143 100644
--- a/avr/common/utils_wait.asm
+++ b/avr/common/utils_wait.asm
@@ -19,6 +19,9 @@
 ; ---------------------------------------------------------------------------
 ; Utils_WaitNanoSecs  waittime_in_ns , cyles_already_used , waitcount_register 
 ;
+; Please note: times smaller than 5000 are unreliable on 1MHZ AtTiny84 (takes much longer
+; than requested, probably due to the fact that one cpu instrction already takes 1us to 2us).
+;
 ;     cycles already used will be subtracted from the delay
 ;     the waittime resolution is 1 cycle (delay from exact to +1 cycle)
 ;     the maximum delay at 20MHz (50ns/clock) is 38350ns