diff --git a/example-custom-shortcuts/src/ofApp.cpp b/example-custom-shortcuts/src/ofApp.cpp
index bda2ac6..d8d84f9 100644
--- a/example-custom-shortcuts/src/ofApp.cpp
+++ b/example-custom-shortcuts/src/ofApp.cpp
@@ -44,6 +44,8 @@ void ofApp::keyPressed(int key){
 		mapper.selectNextSurface();
 	}else if(key == 'j'){
 		mapper.selectPrevSurface();
+	}else if(key == 'd'){
+		mapper.duplicateSurface();
 	}else if(key == 'l'){
 		mapper.selectNextVertex();
 	}else if(key == 'h'){