diff --git a/container/gset/gset_z_example_int_test.go b/container/gset/gset_z_example_int_test.go
new file mode 100644
index 000000000..cc14b4ec8
--- /dev/null
+++ b/container/gset/gset_z_example_int_test.go
@@ -0,0 +1,23 @@
+// Copyright 2020 gf Author(https://github.com/gogf/gf). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with gm file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package gset_test
+
+import (
+	"fmt"
+	"github.com/gogf/gf/container/gset"
+)
+
+func ExampleIntSet_Contains() {
+	var set gset.IntSet
+	set.Add(1)
+	fmt.Println(set.Contains(1))
+	fmt.Println(set.Contains(2))
+
+	// Output:
+	// true
+	// false
+}