diff --git a/src/components/AppView/AppView.js b/src/components/AppView/AppView.js
index 8536140..7b093a1 100644
--- a/src/components/AppView/AppView.js
+++ b/src/components/AppView/AppView.js
@@ -155,6 +155,9 @@ export default function AppView({ setDarkMode }){
 	);
 };
 
-AppView.propTypes = {};
+AppView.propTypes = {
+	/** Callback to toggle dark mode. */
+	"setDarkMode": PropTypes.func.isRequired
+};
 
 AppView.defaultProps = {};
\ No newline at end of file