diff --git a/EIPS/eip-165.md b/EIPS/eip-165.md
index af48ad20..4eaac299 100644
--- a/EIPS/eip-165.md
+++ b/EIPS/eip-165.md
@@ -218,6 +218,9 @@ contract Homer is ERC165, Simpson {
           interfaceID == this.is2D.selector 
                          ^ this.skinColor.selector; // Simpson
     }
+    
+    function is2D() external returns (bool){}
+    function skinColor() external returns (string){}
 }
 ```