diff --git a/docs/en/02_Developer_Guides/00_Model/09_Validation.md b/docs/en/02_Developer_Guides/00_Model/09_Validation.md
index 6441b9631..c8605d7e0 100644
--- a/docs/en/02_Developer_Guides/00_Model/09_Validation.md
+++ b/docs/en/02_Developer_Guides/00_Model/09_Validation.md
@@ -37,7 +37,7 @@ class MyObject extends DataObject
         $result = parent::validate();
 
         if($this->Country == 'DE' && $this->Postcode && strlen($this->Postcode) != 5) {
-            $result->error('Need five digits for German postcodes');
+            $result->addError('Need five digits for German postcodes');
         }
 
         return $result;