diff --git a/editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid b/editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid
index 5446537b3..bcc02a47e 100644
--- a/editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid
+++ b/editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid
@@ -36,6 +36,8 @@ A filter string consists of one or more runs of filter operators that each look
 * ''has'': tests whether a tiddler has the field specified in the operand
 * ''sort'': sorts the tiddlers by the field specified in the operand
 * ''sortcs'': a case sensitive sort of the current tiddlers by the field specified in the operand
+* ''nsort'': sorts the tiddlers numerically by the field specified in the operand
+* ''nsortcs'': a case sensitive (for the non-numerical elements) numerical sort of the current tiddlers by the field specified in the operand
 * ''prefix'': tests whether a tiddlers title starts with the prefix specified in the operand
 * ''limit'': limits the number of subresults to the integer specified in the operand
 * ''tag'': tests whether a given tag is (`[tag[mytag]]`) or is not (`[!tag[mytag]]`) present on the tiddler