diff --git a/config/README.md b/config/README.md
index 77a8e6b33..98d855058 100644
--- a/config/README.md
+++ b/config/README.md
@@ -303,11 +303,11 @@ func TestCalculator_Errors(t *testing.T) {
   t.Parallel()
 
   _, err := newCalculator(NewStaticProvider(map[string]string{
-    "Op": "^", "Left": "3", "Right": "5"
+    "Op": ".", "Left": "3", "Right": "5"
   }))
 
   require.Error(t, err)
-  assert.Contains(t, err.Error(), `unknown operation "^"`)
+  assert.Contains(t, err.Error(), `unknown operation`)
 }
 ```