diff --git a/FlatCAMObj.py b/FlatCAMObj.py
index 56b78dc6..bf87962a 100644
--- a/FlatCAMObj.py
+++ b/FlatCAMObj.py
@@ -655,6 +655,9 @@ class FlatCAMGerber(FlatCAMObj, Gerber):
             self.ui.apertures_table.setItem(self.apertures_row, 3, ap_size_item)   # Aperture Dimensions
             self.ui.apertures_table.setItem(self.apertures_row, 4, ap_dim_item)   # Aperture Dimensions
 
+            empty_plot_item = QtWidgets.QTableWidgetItem('')
+            empty_plot_item.setFlags(~QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEnabled)
+            self.ui.apertures_table.setItem(self.apertures_row, 5, empty_plot_item)
             self.ui.apertures_table.setCellWidget(self.apertures_row, 5, mark_item)
 
             self.apertures_row += 1
@@ -1957,6 +1960,9 @@ class FlatCAMExcellon(FlatCAMObj, Excellon):
             self.ui.tools_table.setItem(self.tool_row, 2, drill_count)  # Number of drills per tool
             self.ui.tools_table.setItem(self.tool_row, 3, slot_count)  # Number of drills per tool
             self.ui.tools_table.setItem(self.tool_row, 4, tool_offset_item)  # Tool offset
+            empty_plot_item = QtWidgets.QTableWidgetItem('')
+            empty_plot_item.setFlags(~QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEnabled)
+            self.ui.tools_table.setItem(self.tool_row, 5, empty_plot_item)
             self.ui.tools_table.setCellWidget(self.tool_row, 5, plot_item)
 
             self.tool_row += 1
diff --git a/README.md b/README.md
index 75cecdd0..3810884b 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,8 @@ CAD program, and create G-Code for Isolation routing.
 - fixed issue in NCC Tool when using area option
 - added formatting for some strings in the app strings, making the future translations easier
 - made changes in the Excellon Tools Table to make it more clear that the tools are selected in the # column and not in the Plot column
+- in Excellon and Gerber Seleted tab made the Plot (mark) columns not selectable
+- some ToolTips were modified
 
 1.09.2019
 
diff --git a/flatcamGUI/ObjectUI.py b/flatcamGUI/ObjectUI.py
index 18742085..d0e178ae 100644
--- a/flatcamGUI/ObjectUI.py
+++ b/flatcamGUI/ObjectUI.py
@@ -738,7 +738,8 @@ class ExcellonObjectUI(ObjectUI):
 
         choose_tools_label = QtWidgets.QLabel(
             _("Select from the Tools Table above\n"
-              "the tools you want to include.")
+              "the hole dias that are to be drilled.\n"
+              "Use the # column to make the selection.")
         )
         self.tools_box.addWidget(choose_tools_label)
 
@@ -761,7 +762,7 @@ class ExcellonObjectUI(ObjectUI):
         self.excellon_gcode_type_radio.setVisible(False)
         gcode_type_label.hide()
 
-        self.generate_cnc_button = QtWidgets.QPushButton(_('Create GCode'))
+        self.generate_cnc_button = QtWidgets.QPushButton(_('Create Drills GCode'))
         self.generate_cnc_button.setToolTip(
             _("Generate the CNC Job.")
         )
@@ -776,7 +777,8 @@ class ExcellonObjectUI(ObjectUI):
 
         self.choose_tools_label2 = QtWidgets.QLabel(
             _("Select from the Tools Table above\n"
-              " the hole dias that are to be milled.")
+              "the hole dias that are to be milled.\n"
+              "Use the # column to make the selection.")
         )
         self.tools_box.addWidget(self.choose_tools_label2)
 
@@ -1113,7 +1115,7 @@ class GeometryObjectUI(ObjectUI):
 
         # Tool change:
 
-        self.toolchzlabel = QtWidgets.QLabel('%s:' %_("Tool change Z"))
+        self.toolchzlabel = QtWidgets.QLabel('%s:' % _("Tool change Z"))
         self.toolchzlabel.setToolTip(
             _(
                 "Z-axis position (height) for\n"
@@ -1352,8 +1354,7 @@ class CNCObjectUI(ObjectUI):
         self.annotation_label.setToolTip(
             _("This selects if to display text annotation on the plot.\n"
               "When checked it will display numbers in order for each end\n"
-              "of a travel line."
-            )
+              "of a travel line.")
         )
         self.annotation_cb = FCCheckBox()