diff --git a/repository/TiddlyWiki/Tiddler.class.st b/repository/TiddlyWiki/Tiddler.class.st
index c8d7fce..0ce89a9 100644
--- a/repository/TiddlyWiki/Tiddler.class.st
+++ b/repository/TiddlyWiki/Tiddler.class.st
@@ -482,6 +482,23 @@ Tiddler >> removeTag: aTag [
 	^ self
 ]
 
+{ #category : #accessing }
+Tiddler >> renameExternalMediaLinksInto: relativePath [ 
+	"This first implementation only renames external media links in custom fields.
+	Further development should offer the possibility to rename also the external media
+	appearing in the tiddler's text."
+	self customFieldsWithMediaLinks keysAndValuesDo: [:customField :oldLink | | link name |
+    	link :=  oldLink asUrl.
+		link  hasScheme ifFalse: [^ self ].
+		name := link segments last copyWithoutAll: '-'.
+		name := name asDashedLowercase.
+		name := (relativePath, '/', NanoID generate, '--', name).
+		self customFields
+			at: customField, '--original' put: oldLink;
+			at: customField put: name
+].	
+]
+
 { #category : #accessing }
 Tiddler >> revision [
 	^ revision