diff --git a/src/GLcvApp.cpp b/src/GLcvApp.cpp
index 19508cedb4cd28de23ae183936c44f45d7c44054..f9f20fc3e9482d701cb4b978c6fc8d6eaf9c0f48 100644
--- a/src/GLcvApp.cpp
+++ b/src/GLcvApp.cpp
@@ -80,7 +80,7 @@ GLcvApp::GLcvApp(GLFWwindow *window, AppConfig &config) :
 	gui->addButton("Screenshot", [this]() { OnScreenshot(); });
 	gui->addVariable<ScreenshotFormat>("Format",
 		[&config](const ScreenshotFormat &fmt) { config.SetRenderFormat(fmt); },
-		[&config]() { return config.GetRenderFormat(); })->setItems({"PNG", "TIFF", "EXR"});
+		[&config]() { return config.GetRenderFormat(); })->setItems({"PNG", "TIFF", "EXR", "PNG (Gray)"});
 	gui->addButton("Reload", [this]() { OnReload(); });
 
 	screen.setVisible(true);