diff --git a/src/frontends/qt4/ui/PrefDisplayUi.ui b/src/frontends/qt4/ui/PrefDisplayUi.ui
index 9bc9caa62f..af9ab6d51d 100644
--- a/src/frontends/qt4/ui/PrefDisplayUi.ui
+++ b/src/frontends/qt4/ui/PrefDisplayUi.ui
@@ -81,7 +81,7 @@
       </sizepolicy>
      </property>
      <property name="toolTip">
-      <string>factor for the preview size</string>
+      <string>Factor for the preview size</string>
      </property>
      <property name="decimals">
       <number>1</number>