diff --git a/gnucash/gtkbuilder/dialog-commodity.glade b/gnucash/gtkbuilder/dialog-commodity.glade
index f2fcd2928f..4667cd3b01 100644
--- a/gnucash/gtkbuilder/dialog-commodity.glade
+++ b/gnucash/gtkbuilder/dialog-commodity.glade
@@ -305,6 +305,8 @@
                 <property name="model">liststore2</property>
                 <property name="has-entry">True</property>
                 <property name="entry-text-column">0</property>
+                <property name="has-tooltip">True</property>
+                <property name="tooltip-markup" translatable="yes">Select a category for the commodity or enter a new one. One might use investment categories like STOCKS and BONDS or exchange names like NASDAQ and LSE.</property>
                 <signal name="changed" handler="gnc_ui_commodity_changed_cb" swapped="no"/>
                 <child internal-child="entry">
                   <object class="GtkEntry" id="combobox-entry5">