diff --git a/libraries/ui/src/QmlWindowClass.cpp b/libraries/ui/src/QmlWindowClass.cpp
index 1758150e0a..90b91c5ec2 100644
--- a/libraries/ui/src/QmlWindowClass.cpp
+++ b/libraries/ui/src/QmlWindowClass.cpp
@@ -61,6 +61,7 @@ QVariantMap QmlWindowClass::parseArguments(QScriptContext* context) {
     }
 
     QUrl url { properties[SOURCE_PROPERTY].toString() };
+    // If the passed URL doesn't correspond to a known scheme, assume it's a local file path
     if (url.scheme() != "http" && url.scheme() != "https" && url.scheme() != "file" && url.scheme() != "about" &&
             url.scheme() != "atp" && url.scheme() != "qrc") {
         properties[SOURCE_PROPERTY] = QUrl::fromLocalFile(url.toString()).toString();