diff --git a/FlatCAMApp.py b/FlatCAMApp.py
index ba959213..2b464e7d 100644
--- a/FlatCAMApp.py
+++ b/FlatCAMApp.py
@@ -1531,6 +1531,7 @@ class App(QtCore.QObject):
 
 
         self.ui.plot_tab_area.setTabText(0, "EDITOR Area")
+        self.ui.plot_tab_area.protectTab(0)
         self.inform.emit("[warning_notcl]Editor is activated ...")
 
     def editor2object(self):
@@ -1592,6 +1593,7 @@ class App(QtCore.QObject):
 
         edited_obj.plot()
         self.ui.plot_tab_area.setTabText(0, "Plot Area")
+        self.ui.plot_tab_area.protectTab(0)
         self.inform.emit("[success] %s is updated, returning to App..." % obj_type)
 
         # reset the Object UI to original settings
diff --git a/README.md b/README.md
index 15ad3cd9..4f9c9ac1 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,8 @@ CAD program, and create G-Code for Isolation routing.
 - Plot Area Tab view can now be toggled, added entry in View Menu and shortcut key CTRL+F10
 - All the tabs in the GUI right side are (Plot Are, Preferences etc) are now detachable to a separate windows which when closed it returns in the previous location in the toolbar. Those detached tabs can be also reattached by drag and drop.
 - fixed postprocessor files so now the bounds values are right aligned (assuming max string length of 9 chars which means 4 digits and 4 decimals)
+- corrected small type in list_sys Tcl command; added a protection of the Plot Area Tab after a successful edit.
+
 
 30.01.2019
 
diff --git a/tclCommands/TclCommandListSys.py b/tclCommands/TclCommandListSys.py
index 87d5a761..3fbda059 100644
--- a/tclCommands/TclCommandListSys.py
+++ b/tclCommands/TclCommandListSys.py
@@ -37,7 +37,7 @@ class TclCommandListSys(TclCommand):
         'args': collections.OrderedDict([
         ]),
         'examples': ['list_sys',
-                     'list_sys ser'
+                     'list_sys ser',
                      'list_sys gerber',
                      'list_sys cncj']
     }