diff --git a/data/ui/Window.ui b/data/ui/Window.ui
index b30c922..55db4ac 100644
--- a/data/ui/Window.ui
+++ b/data/ui/Window.ui
@@ -328,6 +328,7 @@
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">True</property>
+                                    <property name="tooltip_text" translatable="yes">Regular Expression</property>
                                   </object>
                                   <packing>
                                     <property name="expand">False</property>