diff --git a/plugins/USBPrinting/__init__.py b/plugins/USBPrinting/__init__.py
index 4e8e332173..4fab439bad 100644
--- a/plugins/USBPrinting/__init__.py
+++ b/plugins/USBPrinting/__init__.py
@@ -19,5 +19,7 @@ def getMetaData():
     }
 
 def register(app):
+    # We are violating the QT API here (as we use a factory, which is technically not allowed).
+    # but we don't really have another means for doing this (and it seems to you know -work-)
     qmlRegisterSingletonType(USBPrinterOutputDeviceManager.USBPrinterOutputDeviceManager, "Cura", 1, 0, "USBPrinterManager", USBPrinterOutputDeviceManager.USBPrinterOutputDeviceManager.getInstance)
     return {"extension":USBPrinterOutputDeviceManager.USBPrinterOutputDeviceManager.getInstance(), "output_device": USBPrinterOutputDeviceManager.USBPrinterOutputDeviceManager.getInstance()}