diff --git a/core/modules/filterrunprefixes/filter.js b/core/modules/filterrunprefixes/filter.js
new file mode 100644
index 000000000..726732c8e
--- /dev/null
+++ b/core/modules/filterrunprefixes/filter.js
@@ -0,0 +1,31 @@
+/*\
+title: $:/core/modules/filterrunprefixes/filter.js
+type: application/javascript
+module-type: filterrunprefix
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.filter = function(operationSubFunction) {
+	return function(results,source,widget) {
+		if(results.length > 0) {
+			var resultsToRemove = [];
+			$tw.utils.each(results,function(result) {
+				var filtered = operationSubFunction($tw.wiki.makeTiddlerIterator([result]),widget);
+				if(filtered.length === 0) {
+					resultsToRemove.push(result);
+				}
+			});
+			$tw.utils.removeArrayEntries(results,resultsToRemove);
+		}
+	}
+};
+
+})();
diff --git a/editions/tw5.com/tiddlers/filters/syntax/Filter Expression.tid b/editions/tw5.com/tiddlers/filters/syntax/Filter Expression.tid
index a01aa56ec..c78066833 100644
--- a/editions/tw5.com/tiddlers/filters/syntax/Filter Expression.tid	
+++ b/editions/tw5.com/tiddlers/filters/syntax/Filter Expression.tid	
@@ -1,5 +1,5 @@
 created: 20150124182421000
-modified: 20190610165329062
+modified: 20201027134811701
 tags: [[Filter Syntax]]
 title: Filter Expression
 type: text/vnd.tiddlywiki
@@ -21,15 +21,16 @@ If a run has:
 * the prefix `-`, output titles are <<.em removed>> from the filter's output (if such tiddlers exist)
 * the prefix `+`, it receives the filter output so far as its input; its output then <<.em "replaces">> all filter ouput so far and forms the input for the next run
 * <<.from-version "5.1.18">> the prefix `~`, if the filter output so far is an empty list then the output titles of the run are [[dominantly appended|Dominant Append]] to the filter's output. If the filter output so far is not an empty list then the run is ignored
+* <<.from-version "5.1.23">> named prefixes for filter runs are available.
 
 In technical / logical terms:
 
-|!Run |!Interpretation |!Output |
-|`run` |de-duplicated union of sets |... OR run |
-|`=run` |union of sets without de-duplication |... OR run |
-|`+run` |intersection of sets |... AND run |
-|`-run` |difference of sets |... AND NOT run |
-|`~run` |else |... ELSE run |
+|!Run |!Equivalent named prefix |!Interpretation |!Output |
+|`run` |`:or[run]` |de-duplicated union of sets |... OR run |
+|`=run` |`:all[run]` |union of sets without de-duplication |... OR run |
+|`+run` |`:and[run]` |intersection of sets |... AND run |
+|`-run` |`:except[run]` |difference of sets |... AND NOT run |
+|`~run` |`:else[run]` |else |... ELSE run |
 
 The input of a run is normally a list of all the non-[[shadow|ShadowTiddlers]] tiddler titles in the wiki (in no particular order). But the `+` prefix can change this: