diff --git a/src/fime/main.py b/src/fime/main.py
index 26b57cb..8318f5e 100755
--- a/src/fime/main.py
+++ b/src/fime/main.py
@@ -205,6 +205,10 @@ def main():
     # important for QStandardPath to be correct
     QtCore.QCoreApplication.setApplicationName("fime")
     init_logging()
+    if PYSIDE_6:
+        logger.info("using PySide6 / Qt6")
+    else:
+        logger.info("using PySide2 / Qt5")
     # also catches exceptions in other threads
     sys.excepthook = excepthook
     app = App()