diff --git a/consts.go b/consts.go
new file mode 100644
index 0000000..5bed223
--- /dev/null
+++ b/consts.go
@@ -0,0 +1,8 @@
+package gwp
+
+import "time"
+
+const (
+	defaultProgressUpdatePeriod = time.Second
+	defaultCalculateEtaPeriod   = time.Minute
+)
diff --git a/gwp.go b/gwp.go
index 6a1a27c..c94e853 100644
--- a/gwp.go
+++ b/gwp.go
@@ -37,16 +37,14 @@ func New(threadCount int) *WorkerPool {
 		var prevPos int
 		prevTime := time.Now()
 
-		const calculateEtaPeriod = time.Minute
-
-		tickerUpdateText := time.NewTicker(time.Second)
-		tickerCalculateEta := time.NewTicker(calculateEtaPeriod)
+		tickerUpdateText := time.NewTicker(defaultProgressUpdatePeriod)
+		tickerCalculateEta := time.NewTicker(defaultCalculateEtaPeriod)
 		defer func() {
 			tickerUpdateText.Stop()
 			tickerCalculateEta.Stop()
 		}()
 
-		var currentSpeed float64 // items per sec
+		var currentSpeed float64 // jobs per sec
 
 		fmt.Fprintf(os.Stderr, endLine)
 		for {