diff --git a/chrome/content/zotero/overlay.xul b/chrome/content/zotero/overlay.xul
index bae40857a..b296329e1 100644
--- a/chrome/content/zotero/overlay.xul
+++ b/chrome/content/zotero/overlay.xul
@@ -116,6 +116,7 @@
 								<menuseparator id="zotero-tb-actions-separator"/>
 								<menuitem id="zotero-tb-actions-prefs" label="&zotero.toolbar.preferences.label;"
 									oncommand="window.openDialog('chrome://zotero/content/preferences.xul', 'zotero-prefs', 'chrome,titlebar,toolbar,' + Zotero.Prefs.get('browser.preferences.instantApply', true) ? 'dialog=no' : 'modal')"/>
+								<menuitem id="zotero-tb-actions-documentation" label="&zotero.toolbar.documentation.label;" oncommand="window.open('http://www.zotero.org/documentation/', '', 'menubar=yes,location=yes,toolbar=yes,personalbar=yes,resizable=yes,scrollbars=yes,status=yes');"/>
 								<menuitem id="zotero-tb-actions-about" label="&zotero.toolbar.about.label;" oncommand="window.openDialog('chrome://zotero/content/about.xul', 'about', 'chrome')"/>
 							</menupopup>
 						</toolbarbutton>
diff --git a/chrome/locale/en-US/zotero/zotero.dtd b/chrome/locale/en-US/zotero/zotero.dtd
index dbf13257c..f31859ae5 100644
--- a/chrome/locale/en-US/zotero/zotero.dtd
+++ b/chrome/locale/en-US/zotero/zotero.dtd
@@ -44,6 +44,7 @@
 <!ENTITY zotero.toolbar.import.label					"Import...">
 <!ENTITY zotero.toolbar.export.label					"Export Library...">
 <!ENTITY zotero.toolbar.preferences.label				"Preferences...">
+<!ENTITY zotero.toolbar.documentation.label			"Documentation...">
 <!ENTITY zotero.toolbar.about.label					"About Zotero...">
 <!ENTITY zotero.toolbar.advancedSearch				"Advanced Search">
 <!ENTITY zotero.toolbar.search.label					"Search:">