diff --git a/_examples/spinnerBar/main.go b/_examples/spinnerBar/main.go
index bdb3abd..f03939b 100644
--- a/_examples/spinnerBar/main.go
+++ b/_examples/spinnerBar/main.go
@@ -62,10 +62,13 @@
 			rng := rand.New(rand.NewSource(time.Now().UnixNano()))
 			max := 100 * time.Millisecond
 			for i := 0; i < total; i++ {
+				// start variable is solely for EWMA calculation
+				// EWMA's unit of measure is an iteration's taken time
 				start := time.Now()
 				time.Sleep(time.Duration(rng.Intn(10)+1) * max / 10)
-				// since ewma decorator is used, we need to pass time.Since(start)
-				bar.Increment(time.Since(start))
+				bar.Increment()
+				// we need to call DecoratorEwmaUpdate to fulfill ewma decorator's contract
+				bar.DecoratorEwmaUpdate(time.Since(start))
 			}
 		}()
 	}