Merge pull request #9397 from dotnet/main

xml/System.Text.Json.Serialization/JsonIncludeAttribute.xml

@@ -29,11 +29,20 @@
 
 ## Remarks
 
-When applied to a property, indicates that non-public getters and setters can be used for serialization and deserialization. Non-public properties are not supported.
+When applied to a property, this attribute indicates that non-public *getters* and *setters* can be used for serialization and deserialization.
+
+> [!NOTE]
+> Even with this attribute, the serialization source generator is still limited to non-public members that are *accessible* to the generated code. *Accessible* non-public members include those that are:
+>
+> - `internal` when in the same assembly as the generated context.
+> - `protected`, `protected internal`, or `private protected` when the generated context is in a class that derives from the type.
+> - `private` if the type is nested in the same class as the generated context.
+
+In .NET 6 and .NET 7, non-public properties aren't supported.
 
           ]]></format>
     </remarks>
-    <exception cref="T:System.InvalidOperationException">The attribute is applied to a non-public property.</exception>
+    <exception cref="T:System.InvalidOperationException">.NET 7 and earlier versions only: The attribute is applied to a non-public property.</exception>
   </Docs>
   <Members>
     <Member MemberName=".ctor">