diff --git a/README.md b/README.md
index 6c14bbf..419c46f 100644
--- a/README.md
+++ b/README.md
@@ -455,8 +455,8 @@ The following code implements the aforementioned examples:
 ```go
 result := validation.ValidateStruct(&a,
     validation.Field(&a.Unit, validation.When(a.Quantity != "", validation.Required).Else(validation.Nil)),
-    validation.Field(&a.Phone, validation.When(a.Email == "", validation.Required.Error('Either phone or Email is required.')),
-    validation.Field(&a.Email, validation.When(a.Phone == "", validation.Required.Error('Either phone or Email is required.')),
+    validation.Field(&a.Phone, validation.When(a.Email == "", validation.Required.Error("Either phone or Email is required.")),
+    validation.Field(&a.Email, validation.When(a.Phone == "", validation.Required.Error("Either phone or Email is required.")),
 )
 ```
 
@@ -467,8 +467,8 @@ The above code can also be simplified using the shortcut `validation.Required.Wh
 ```go
 result := validation.ValidateStruct(&a,
     validation.Field(&a.Unit, validation.Required.When(a.Quantity != ""), validation.Nil.When(a.Quantity == "")),
-    validation.Field(&a.Phone, validation.Required.When(a.Email == "").Error('Either phone or Email is required.')),
-    validation.Field(&a.Email, validation.Required.When(a.Phone == "").Error('Either phone or Email is required.')),
+    validation.Field(&a.Phone, validation.Required.When(a.Email == "").Error("Either phone or Email is required.")),
+    validation.Field(&a.Email, validation.Required.When(a.Phone == "").Error("Either phone or Email is required.")),
 )
 ```