diff --git a/README.md b/README.md
index 4ac2feb..280ada2 100644
--- a/README.md
+++ b/README.md
@@ -19,15 +19,15 @@ func main() {
     defer log.Sync()
 
     log.Info("Hello world!")
-    log.Info("Hello ", String("string_key", "value"), Int("int_key", 666))
+    log.Info("Hello ", log.String("string_key", "value"), log.Int("int_key", 666))
     log.Infof("Hello %s!", "world")
     log.Infow("Hello ", "string_key", "value", "int_key", 666)
 
     log.WithName("logger1").Warn("I am logger1")
     log.WithName("logger2").Warn("I am logger2")
 
-    log.WithFields(String("f1", "value"), Int("f2", 888)).Error("Hello world!")
-    log.WithName("logger3").WithFields(String("f1", "value"), Int("f2", 888)).Error("Hello world!")
+    log.WithFields(log.String("f1", "value"), log.Int("f2", 888)).Error("Hello world!")
+    log.WithName("logger3").WithFields(log.String("f1", "value"), log.Int("f2", 888)).Error("Hello world!")
 }
 ```
 
@@ -67,15 +67,15 @@ func main() {
     log.Init(opts)
 
     log.Info("Hello world!")
-    log.Info("Hello ", String("string_key", "value"), Int("int_key", 666))
+    log.Info("Hello ", log.String("string_key", "value"), log.Int("int_key", 666))
     log.Infof("Hello %s!", "world")
     log.Infow("Hello ", "string_key", "value", "int_key", 666)
 
     log.WithName("logger1").Warn("I am logger1")
     log.WithName("logger2").Warn("I am logger2")
 
-    log.WithFields(String("f1", "value"), Int("f2", 888)).Error("Hello world!")
-    log.WithName("logger3").WithFields(String("f1", "value"), Int("f2", 888)).Error("Hello world!")
+    log.WithFields(log.String("f1", "value"), log.Int("f2", 888)).Error("Hello world!")
+    log.WithName("logger3").WithFields(log.String("f1", "value"), log.Int("f2", 888)).Error("Hello world!")
 
     // log file rotate test
     for i := 0; i <= 20000; i++ {