diff --git a/gronx.go b/gronx.go
index f4c9fd2..0c6fdcb 100644
--- a/gronx.go
+++ b/gronx.go
@@ -2,7 +2,6 @@ package gronx
 
 import (
 	"errors"
-	"fmt"
 	"regexp"
 	"strings"
 	"time"
@@ -43,7 +42,6 @@ func AddTag(tag, expr string) error {
 	expr = strings.Join(segs, " ")
 
 	expressions[tag] = expr
-	fmt.Println(expr)
 	return nil
 }
 
diff --git a/gronx_test.go b/gronx_test.go
index b08c177..843c432 100644
--- a/gronx_test.go
+++ b/gronx_test.go
@@ -99,6 +99,15 @@ func TestAddTag(t *testing.T) {
 		if err != nil {
 			t.Error("expected nil, got err")
 		}
+
+		expr, ok := expressions["@2s"]
+		if !ok {
+			t.Error("expected true, got false")
+		}
+
+		if expr != "*/2 * * * * *" {
+			t.Error("expected */2 * * * * *")
+		}
 	})
 
 	t.Run("add conflict tag", func(t *testing.T) {