diff --git a/prometheus/timer.go b/prometheus/timer.go
index d6e0d11..0767281 100644
--- a/prometheus/timer.go
+++ b/prometheus/timer.go
@@ -32,7 +32,7 @@ type Timer struct {
 	observer Observer
 }
 
-func StartTimer() *Timer {
+func NewTimer() *Timer {
 	return &Timer{begin: time.Now()}
 }
 
@@ -46,7 +46,7 @@ func (t *Timer) WithGauge(g Gauge) *Timer {
 	return t
 }
 
-func (t *Timer) Stop() {
+func (t *Timer) ObserveDuration() {
 	if t.observer != nil {
 		t.observer.Observe(time.Since(t.begin).Seconds())
 	}
diff --git a/prometheus/timer_test.go b/prometheus/timer_test.go
index 747a7ba..3c117ef 100644
--- a/prometheus/timer_test.go
+++ b/prometheus/timer_test.go
@@ -26,8 +26,8 @@ func TestTimerObserve(t *testing.T) {
 		},
 	)
 
-	timer := StartTimer().With(his)
-	timer.Stop()
+	timer := NewTimer().With(his)
+	timer.ObserveDuration()
 	m := &dto.Metric{}
 	his.Write(m)