diff --git a/repository/TiddlyWiki/Tiddler.class.st b/repository/TiddlyWiki/Tiddler.class.st
index 28ab1b0..5585cc2 100644
--- a/repository/TiddlyWiki/Tiddler.class.st
+++ b/repository/TiddlyWiki/Tiddler.class.st
@@ -267,6 +267,12 @@ Tiddler >> gtTextFor: aView [
 		text: [ text ]
 ]
 
+{ #category : #testing }
+Tiddler >> hasUID [
+
+	^ self customFields includesKey: 'uid'
+]
+
 { #category : #accessing }
 Tiddler >> importFedWikiPage: pageViewUrlString [
 	| pageTitle pageViewUrl pageData |
diff --git a/repository/TiddlyWiki/TiddlyWiki.class.st b/repository/TiddlyWiki/TiddlyWiki.class.st
index b825077..b18a4cf 100644
--- a/repository/TiddlyWiki/TiddlyWiki.class.st
+++ b/repository/TiddlyWiki/TiddlyWiki.class.st
@@ -827,6 +827,12 @@ TiddlyWiki >> tiddlersJSONUrl [
 	self remote ifNil: [^ nil].
 ]
 
+{ #category : #accessing }
+TiddlyWiki >> tiddlersMissingUID [
+
+	^ self tiddlers reject: [ :tiddler | (tiddler customFields includesKey: 'uid') or: [ (tiddler title beginsWith:'$') ] ].
+]
+
 { #category : #accessing }
 TiddlyWiki >> updateFilesFromRemote [