diff --git a/README.md b/README.md
index c1d900e..09e88f6 100644
--- a/README.md
+++ b/README.md
@@ -19,11 +19,14 @@ import (
 )
 
 func main(){
+
+    expr := `foo + 1 > bar`
 	
     param := map[string]interface{}{
         "foo": 5,
         "bar": 6,
     }
+	
     res, err := Do(context.Background(), expr, param)
     if err != nil {
         panic(err)
diff --git a/kit/rule/README.md b/kit/rule/README.md
index e2c6783..93e1e0c 100644
--- a/kit/rule/README.md
+++ b/kit/rule/README.md
@@ -8,10 +8,13 @@ import (
 
 func main(){
 	
+    expr := `foo + 1 > bar`
+	
     param := map[string]interface{}{
         "foo": 5,
         "bar": 6,
     }
+	
     res, err := Do(context.Background(), expr, param)
     if err != nil {
         panic(err)