diff --git a/README.md b/README.md
index 285ba65..f755d31 100644
--- a/README.md
+++ b/README.md
@@ -186,7 +186,7 @@ Or create client with exponential backoff
 
 initalTimeout := 2*time.Millisecond            // Inital timeout
 maxTimeout := 9*time.Millisecond               // Max time out
-exponentFactor := 2                            // Multiplier
+exponentFactor := float64(2)                   // Multiplier
 maximumJitterInterval := 2*time.Millisecond    // Max jitter interval. It must be more than 1*time.Millisecond
 
 backoff := heimdall.NewExponentialBackoff(initalTimeout, maxTimeout, exponentFactor, maximumJitterInterval)