diff --git a/README.md b/README.md
index 1e436cd..f5e8ed9 100644
--- a/README.md
+++ b/README.md
@@ -36,11 +36,11 @@ All functions are controlled by the KY-040 encoder:
 |Value|Description|
 |:----|:----------|
 |SPEEDINC|increment of speed values when turning the encoder|
-|FANMIN|fan minimum speed|
-|FANMAX|maximum speed of the fan|
+|FANMIN|fan minimum speed (should be a value at which the fan runs safely)|
+|FANMAX|maximum speed of the fan (it is important that this is the real maximum value of the fan)|
 |RINTERVAL|regulation interval (ms)|
-|RDELAY|extra regulation delay when value changes|
-|CATCHSTOP|stop interval for stir fish catch function|
+|RDELAY|extra regulation delay when value changes (ms)|
+|CATCHSTOP|stop interval for stir fish catch function (ms)|
 |PWM0, PWN1|PWM output pins|
 |I0, I1|interrupts for rpm measurement (2 and 3 for Leonardo and ProMicro / 0 and 1 for Uno)|
 |CLK, DT, SW|pins for KY-040 encoder|