diff --git a/pySim/transport/calypso.py b/pySim/transport/calypso.py
index d7d9649..3fd9992 100644
--- a/pySim/transport/calypso.py
+++ b/pySim/transport/calypso.py
@@ -79,6 +79,8 @@
 
     def __init__(self, sock_path: str = "/tmp/osmocom_l2", **kwargs):
         super().__init__(**kwargs)
+        print("Using Calypso-based (OsmocomBB) reader interface")
+
         # Make sure that a given socket path exists
         if not os.path.exists(sock_path):
             raise ReaderError(