diff --git a/src/revpicommander/helper.py b/src/revpicommander/helper.py
index 04e203b..545008a 100644
--- a/src/revpicommander/helper.py
+++ b/src/revpicommander/helper.py
@@ -476,7 +476,13 @@ class ConnectionManager(QtCore.QThread):
             self.connection_disconnected.emit()
 
     def pyload_simulate(self, configrsc: str, procimg: str, clean_existing: bool):
-        """Start the simulator for piControl on local computer."""
+        """
+        Start the simulator for piControl on local computer.
+
+        :param configrsc: piCtory configuration
+        :param procimg: Process image, which is a 4 kByte file for simulation
+        :param clean_existing: Reset the file to ZERO \x00 bytes
+        """
         pi.logger.debug("ConnectionManager.start_simulate")
 
         if not exists(procimg) or clean_existing:
diff --git a/src/revpicommander/revpicommander.py b/src/revpicommander/revpicommander.py
index 094dd6d..a4033a6 100644
--- a/src/revpicommander/revpicommander.py
+++ b/src/revpicommander/revpicommander.py
@@ -316,7 +316,7 @@ class RevPiCommander(QtWidgets.QMainWindow, Ui_win_revpicommander):
         configrsc_file = helper.settings.value("simulator/configrsc", "", str)
         procimg_file = helper.settings.value("simulator/procimg", "", str)
 
-        if helper.cm.pyload_simulate(configrsc_file, procimg_file, diag.cbx_stop_remove.isChecked()):
+        if helper.cm.pyload_simulate(configrsc_file, procimg_file, diag.clean_procimg):
             QtWidgets.QMessageBox.information(
                 self, self.tr("Simulator started..."), self.tr(
                     "The simulator is running!\n\nYou can work with this simulator if your call "