diff --git a/mainwindow.ui b/mainwindow.ui
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -106,6 +106,9 @@
             <layout class="QGridLayout" name="gridLayout_2">
              <item row="2" column="0">
               <widget class="QRadioButton" name="rbUint32">
+               <property name="toolTip">
+                <string>unsigned 4 bytes integer</string>
+               </property>
                <property name="text">
                 <string>uint32</string>
                </property>
@@ -113,6 +116,9 @@
              </item>
              <item row="0" column="1">
               <widget class="QRadioButton" name="rbInt8">
+               <property name="toolTip">
+                <string>signed 1 byte integer</string>
+               </property>
                <property name="text">
                 <string>int8</string>
                </property>
@@ -120,6 +126,9 @@
              </item>
              <item row="0" column="0">
               <widget class="QRadioButton" name="rbUint8">
+               <property name="toolTip">
+                <string>unsigned 1 byte integer</string>
+               </property>
                <property name="text">
                 <string>uint8</string>
                </property>
@@ -140,6 +149,9 @@
              </item>
              <item row="1" column="1">
               <widget class="QRadioButton" name="rbInt16">
+               <property name="toolTip">
+                <string>signed 2 bytes integer</string>
+               </property>
                <property name="text">
                 <string>int16</string>
                </property>
@@ -147,6 +159,9 @@
              </item>
              <item row="2" column="1">
               <widget class="QRadioButton" name="rbInt32">
+               <property name="toolTip">
+                <string>signed 4 bytes integer</string>
+               </property>
                <property name="text">
                 <string>int32</string>
                </property>
@@ -154,6 +169,9 @@
              </item>
              <item row="3" column="0">
               <widget class="QRadioButton" name="rbFloat">
+               <property name="toolTip">
+                <string>4 bytes floating point number</string>
+               </property>
                <property name="text">
                 <string>float</string>
                </property>
@@ -161,6 +179,9 @@
              </item>
              <item row="1" column="0">
               <widget class="QRadioButton" name="rbUint16">
+               <property name="toolTip">
+                <string>unsigned 2 bytes integer</string>
+               </property>
                <property name="text">
                 <string>uint16</string>
                </property>
@@ -203,6 +224,9 @@
             <layout class="QVBoxLayout" name="verticalLayout">
              <item>
               <widget class="QRadioButton" name="rbLittleE">
+               <property name="toolTip">
+                <string>least significant byte first</string>
+               </property>
                <property name="text">
                 <string>Little Endian</string>
                </property>
@@ -213,6 +237,9 @@
              </item>
              <item>
               <widget class="QRadioButton" name="rbBigE">
+               <property name="toolTip">
+                <string>most significant byte first</string>
+               </property>
                <property name="text">
                 <string>Big Endian</string>
                </property>
@@ -295,6 +322,9 @@
               <height>16777215</height>
              </size>
             </property>
+            <property name="toolTip">
+             <string>lower limit of Y axis</string>
+            </property>
             <property name="value">
              <double>0.000000000000000</double>
             </property>
@@ -302,6 +332,9 @@
           </item>
           <item row="0" column="1">
            <widget class="QSpinBox" name="spNumOfSamples">
+            <property name="toolTip">
+             <string>length of X axis</string>
+            </property>
             <property name="keyboardTracking">
              <bool>false</bool>
             </property>
@@ -364,6 +397,9 @@
               <height>16777215</height>
              </size>
             </property>
+            <property name="toolTip">
+             <string>upper limit of Y axis</string>
+            </property>
             <property name="maximum">
              <double>1000.000000000000000</double>
             </property>
@@ -492,6 +528,8 @@
      <string>File</string>
     </property>
     <addaction name="actionExportCsv"/>
+    <addaction name="separator"/>
+    <addaction name="actionQuit"/>
    </widget>
    <addaction name="menuFile"/>
    <addaction name="menuHelp"/>
@@ -550,6 +588,14 @@
     <string>Export plot data to CSV</string>
    </property>
   </action>
+  <action name="actionQuit">
+   <property name="text">
+    <string>Quit</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+Q</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>