diff --git a/core/modules/filters/indexes.js b/core/modules/filters/indexes.js
new file mode 100644
index 000000000..362d16c73
--- /dev/null
+++ b/core/modules/filters/indexes.js
@@ -0,0 +1,43 @@
+/*\
+title: $:/core/modules/filters/indexes.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator for returning the indexes of a data tiddler
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.indexes = function(source,operator,options) {
+	var self = this,
+		results = [];
+	// Function to check an individual title
+	function checkTiddler(title) {
+		// Return the fields on the specified tiddler
+		var data = options.wiki.getTiddlerData(title,{});
+		if(data) {
+			$tw.utils.pushTop(results,Object.keys(data));
+		}
+	}
+	// Iterate through the source tiddlers
+	if($tw.utils.isArray(source)) {
+		$tw.utils.each(source,function(title) {
+			checkTiddler(title);
+		});
+	} else {
+		$tw.utils.each(source,function(element,title) {
+			checkTiddler(title);
+		});
+	}
+	results.sort();
+	return results;
+};
+
+})();
diff --git a/editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid b/editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid
index d3cdd1346..cbfb54e18 100644
--- a/editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid
+++ b/editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid
@@ -1,5 +1,5 @@
 created: 20130827080000000
-modified: 20140210141253282
+modified: 20140220091253282
 tags: concepts
 title: TiddlerFilters
 type: text/vnd.tiddlywiki
@@ -67,8 +67,8 @@ A filter string consists of one or more runs of filter operators that each look
 * ''bf'': another synonym for ''rest''
 * ''butlast'': selects all but the last tiddler of the list (or all but the last n if the operand is n)
 * ''bl'': another synonym for ''butlast''
-* ''nth'': selects the n-th tiddler of the list. Defaults to n = 1.
-
+* ''nth'': selects the n-th tiddler of the list. Defaults to n = 1
+* ''indexes'': selects the names of the indexes within a [[DataTiddler|DataTiddlers]]
 
 An operator can be negated with by preceding it with `!`, for example `[!tag[Tommy]]` selects the tiddlers that are not tagged with `Tommy`.