diff --git a/README.md b/README.md
index 1fdd77a..25ebde5 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ This means that the actual f_cpu is 4.8Mhz to calculate the delay times
 we can use this formula:
 
 $$
-msPerOverflow = 1000ms / (\frac{4.8Mhz}{64} / 256) \approx 6.8ms
+msPerOverflow = 1000ms / (\frac{4.8Mhz}{64} * \frac{1}{256}) \approx 6.8ms
 $$
 
 Where $64$ is the pre scaler setting and $256$ is the maximum value of the 8bit