diff --git a/chipstream/gui/main_window.ui b/chipstream/gui/main_window.ui
index 212f270..9d6216d 100644
--- a/chipstream/gui/main_window.ui
+++ b/chipstream/gui/main_window.ui
@@ -58,6 +58,9 @@
         <layout class="QGridLayout" name="gridLayout_2">
          <item row="1" column="1">
           <widget class="QSpinBox" name="spinBox_2">
+           <property name="toolTip">
+            <string>Mask-generating threshold for the background-corrected image.</string>
+           </property>
            <property name="minimum">
             <number>-10</number>
            </property>
@@ -143,19 +146,14 @@
          </sizepolicy>
         </property>
         <property name="title">
-         <string>Output Options</string>
+         <string>Processing</string>
         </property>
         <layout class="QVBoxLayout" name="verticalLayout_8">
          <item>
           <widget class="QComboBox" name="comboBox_3">
            <item>
             <property name="text">
-             <string>Use basins (most efficient)</string>
-            </property>
-           </item>
-           <item>
-            <property name="text">
-             <string>Edit files in-place (only for disabled segmenter)</string>
+             <string>Use basins whenever possible (most efficient)</string>
             </property>
            </item>
            <item>
@@ -165,6 +163,19 @@
            </item>
           </widget>
          </item>
+         <item>
+          <widget class="QSpinBox" name="spinBox_procs">
+           <property name="suffix">
+            <string> Worker Processes</string>
+           </property>
+           <property name="minimum">
+            <number>2</number>
+           </property>
+           <property name="maximum">
+            <number>64</number>
+           </property>
+          </widget>
+         </item>
         </layout>
        </widget>
       </item>
@@ -200,6 +211,9 @@
     <property name="title">
      <string>File</string>
     </property>
+    <addaction name="actionAdd"/>
+    <addaction name="actionClear"/>
+    <addaction name="separator"/>
     <addaction name="actionQuit"/>
    </widget>
    <addaction name="menuFile"/>
@@ -231,6 +245,16 @@
     <string>Quit</string>
    </property>
   </action>
+  <action name="actionAdd">
+   <property name="text">
+    <string>Add data</string>
+   </property>
+  </action>
+  <action name="actionClear">
+   <property name="text">
+    <string>Clear forms</string>
+   </property>
+  </action>
  </widget>
  <resources/>
  <connections/>