diff --git a/config/tmtcc_com_config.py b/config/tmtcc_com_config.py
index 0132f734b1f3a56bbe26b1748fce9a8ba91aa6d7..bb4bdffc1855acbe3e2fc2b99818b62ef7cbe047 100644
--- a/config/tmtcc_com_config.py
+++ b/config/tmtcc_com_config.py
@@ -39,6 +39,7 @@ def set_communication_interface(tmtc_printer: TmTcPrinter) -> Union[Communicatio
         elif g.G_COM_IF == g.ComInterfaces.Serial:
             serial_baudrate = g.G_SERIAL_BAUDRATE
             serial_timeout = g.G_SERIAL_TIMEOUT
+            # Determine COM port, either extract from JSON file or ask from user.
             com_port = determine_com_port()
             communication_interface = SerialComIF(
                 tmtc_printer=tmtc_printer, com_port=com_port, baud_rate=serial_baudrate,