diff --git a/Odata-docs/client/using-poco-classes.md b/Odata-docs/client/using-poco-classes.md
index ac1b70f0..47c912b5 100644
--- a/Odata-docs/client/using-poco-classes.md
+++ b/Odata-docs/client/using-poco-classes.md
@@ -20,7 +20,7 @@ In order to do this you only need to extend the `DataServiceContext` class in yo
 
 ```csharp
 // Person class with Odata annotations
-[Key('Id')]
+[Key("Id")]
 public class Person
 {
         public string Id { get; set; }