diff --git a/README.md b/README.md
index b76eaa0..9a78349 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,24 @@
 # swap variables
+
+```go
+// myconfig.go
+
+var myConfig struct {
+    Foo string
+    Bar int
+}
+
+func init() {
+    readConfig(&myConfig)
+}
+
+// test.go
+import "github.com/tada-team/swap"
+
+func TestWithSwap(t *testing.T) {
+	defer swap.Bool(&myConfig.Foo, "test value")()
+	defer swap.Int(&myConfig.Bar, 42)()
+
+    // test cases
+}
+```