diff --git a/mozilla/mailnews/base/search/resources/content/FilterListDialog.xul b/mozilla/mailnews/base/search/resources/content/FilterListDialog.xul
index 4d078af3653..904db7a3c74 100644
--- a/mozilla/mailnews/base/search/resources/content/FilterListDialog.xul
+++ b/mozilla/mailnews/base/search/resources/content/FilterListDialog.xul
@@ -162,6 +162,8 @@ Contributor(s):  Hkan Waara <hwaara@chello.se>
                   oncommand="onEditFilter();"/>
           <button id="deleteButton" label="&deleteButton.label;" accesskey="&deleteButton.accesskey;" 
                   oncommand="onDeleteFilter();"/>
+          <button label="&helpButton.label;" accesskey="&helpButton.accesskey;" 
+                  oncommand="openHelp('mail-filters');"/>
           <spacer flex="1"/>
           <button id="reorderUpButton" label="&reorderUpButton.label;" accesskey="&reorderUpButton.accesskey;" 
                   oncommand="onUp(event);"/>
diff --git a/mozilla/mailnews/base/search/resources/locale/en-US/FilterListDialog.dtd b/mozilla/mailnews/base/search/resources/locale/en-US/FilterListDialog.dtd
index 3d84e90e3c4..dcbaa76fd8a 100644
--- a/mozilla/mailnews/base/search/resources/locale/en-US/FilterListDialog.dtd
+++ b/mozilla/mailnews/base/search/resources/locale/en-US/FilterListDialog.dtd
@@ -23,3 +23,5 @@
 <!ENTITY folderPickerPrefix.label "Run selected filter(s) on:">
 <!ENTITY folderPickerPrefix.accesskey "i">
 <!ENTITY choosethis.label "choose this folder">
+<!ENTITY helpButton.label "Help">
+<!ENTITY helpButton.accesskey "H">