diff --git a/editions/clientserver/tiddlers/MathML.tid b/editions/tw5.com/tiddlers/definitions/MathML.tid
similarity index 87%
rename from editions/clientserver/tiddlers/MathML.tid
rename to editions/tw5.com/tiddlers/definitions/MathML.tid
index bba7933ec..3de14b7aa 100644
--- a/editions/clientserver/tiddlers/MathML.tid
+++ b/editions/tw5.com/tiddlers/definitions/MathML.tid
@@ -2,9 +2,11 @@ created: 201309012131
 creator: JeremyRuston
 modified: 201309012131
 modifier: JeremyRuston
-tags: demo
+tags: demo definitions
 title: MathML
 
+MathML is a markup language for mathematical notation that can be used with HTML.
+
 If your browser supports it, MathML elements can be used in TiddlyWiki5 WikiText just like HTML.
 
 For example:
diff --git a/editions/tw5.com/tiddlers/definitions/ListField.tid b/editions/tw5.com/tiddlers/fields/ListField.tid
similarity index 100%
rename from editions/tw5.com/tiddlers/definitions/ListField.tid
rename to editions/tw5.com/tiddlers/fields/ListField.tid