diff --git a/src/glade/editname.glade b/src/glade/editname.glade
index 0b9f715a2..91a1837b1 100644
--- a/src/glade/editname.glade
+++ b/src/glade/editname.glade
@@ -197,7 +197,7 @@
                               <object class="ValidatableMaskedEntry" id="call">
                                 <property name="visible">True</property>
                                 <property name="can_focus">True</property>
-                                <property name="tooltip_text" translatable="yes">Part of the Given name that is the normally used name.</property>
+                                <property name="tooltip_text" translatable="yes">Part of the Given name that is the normally used name. If background is red, call name is not part of Given name and will not be printed underlined in some reports.</property>
                                 <property name="invisible_char">●</property>
                               </object>
                               <packing>
diff --git a/src/glade/editperson.glade b/src/glade/editperson.glade
index 70650b4d4..60d23d9d9 100644
--- a/src/glade/editperson.glade
+++ b/src/glade/editperson.glade
@@ -88,7 +88,7 @@
                         <property name="width_request">75</property>
                         <property name="visible">True</property>
                         <property name="can_focus">True</property>
-                        <property name="tooltip_text" translatable="yes">Part of the Given name that is the normally used name.</property>
+                        <property name="tooltip_text" translatable="yes">Part of the Given name that is the normally used name. If background is red, call name is not part of Given name and will not be printed underlined in some reports.</property>
                         <property name="invisible_char">●</property>
                       </object>
                       <packing>