diff --git a/editions/tw5.com/tiddlers/features/SafeMode.tid b/editions/tw5.com/tiddlers/features/SafeMode.tid
index 03fa8f00d..dfe634e23 100644
--- a/editions/tw5.com/tiddlers/features/SafeMode.tid
+++ b/editions/tw5.com/tiddlers/features/SafeMode.tid
@@ -1,5 +1,5 @@
 created: 20140419082845576
-modified: 20160610082458079
+modified: 20190912093109517
 tags: Features
 title: SafeMode
 type: text/vnd.tiddlywiki
@@ -8,6 +8,8 @@ type: text/vnd.tiddlywiki
 
 Safe mode provides a way to disabling most customisations in TiddlyWiki. This is useful because if TiddlyWiki is customised incorrectly it can be rendered inoperable. A particular issue is that some customisations break when upgrading to a newer core version of TiddlyWiki (especially during the beta).
 
+<<.warning "Safe mode should only be used with the single file configuration of TiddlyWiki, and then only with savers that do not autosave. Using safe mode in the client server configuration can lead to data loss.">>
+
 ! Enabling Safe Mode
 
 Safe mode is enabled in the browser by starting TiddlyWiki with the URL hash set to the string `#:safe`. For example: