diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index d8aaf82..72a3227 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -659,6 +659,8 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
 
     @asyncSlot(object, object)
     async def send_command(self, param, changes):
+        """Translates parameter tree changes into thermostat set_param calls"""
+
         for inner_param, change, data in changes:
             if change == 'value':
                 if inner_param.opts.get("param", None) is not None: