diff --git a/astro.ui b/astro.ui
index d0be95965..d48799287 100644
--- a/astro.ui
+++ b/astro.ui
@@ -60,7 +60,7 @@
          <item>
           <widget class="QRadioButton" name="rbConstFreqOnMoon">
            <property name="toolTip">
-            <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Both stations correct for Doppler shift such that they would be heard on the moon at the sked frequency.&lt;/p&gt;&lt;p&gt;If the rig does not accept CAT QSY commands while transmitting a single correction is applied for the whole transmit period.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+            <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Both stations correct for Doppler shift such that they would be heard on the moon at the sked frequency.&lt;/p&gt;&lt;p&gt;If the rig does not accept CAT QSY commands while transmitting a single correction is applied for the whole transmit period.&lt;/p&gt;&lt;p&gt;Use this option also for Echo mode.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
            </property>
            <property name="text">
             <string>Constant frequency on Moon</string>