diff --git a/usb_application/ccid_select.py b/usb_application/ccid_select.py
index 443381c0..264d6ae3 100755
--- a/usb_application/ccid_select.py
+++ b/usb_application/ccid_select.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python
+# This is only test code for testing the smartcard communication
+# by sending a test command and printing the answer of the smartcard.
 
 from smartcard.scard import *
 import smartcard.util