diff --git a/example_test.go b/example_test.go
index 31e509d..8162409 100644
--- a/example_test.go
+++ b/example_test.go
@@ -7,11 +7,38 @@ import (
 	"go.uber.org/ratelimit"
 )
 
-func Example() {
-	rl := ratelimit.New(100) // per second
+func Example_default() {
+	rl := ratelimit.New(100) // per second, some slack.
+
+	rl.Take()                         // Initialize.
+	time.Sleep(time.Millisecond * 45) // Let some time pass.
 
 	prev := time.Now()
 	for i := 0; i < 10; i++ {
+		now := rl.Take()
+		if i > 0 {
+			fmt.Println(i, now.Sub(prev).Round(time.Millisecond*2))
+		}
+		prev = now
+	}
+
+	// Output:
+	// 1 0s
+	// 2 0s
+	// 3 0s
+	// 4 4ms
+	// 5 10ms
+	// 6 10ms
+	// 7 10ms
+	// 8 10ms
+	// 9 10ms
+}
+
+func Example_withoutSlack() {
+	rl := ratelimit.New(100, ratelimit.WithoutSlack) // per second, no slack.
+
+	prev := time.Now()
+	for i := 0; i < 6; i++ {
 		now := rl.Take()
 		if i > 0 {
 			fmt.Println(i, now.Sub(prev))
@@ -25,8 +52,4 @@ func Example() {
 	// 3 10ms
 	// 4 10ms
 	// 5 10ms
-	// 6 10ms
-	// 7 10ms
-	// 8 10ms
-	// 9 10ms
 }