diff --git a/core/ui/EditTemplate/body.tid b/core/ui/EditTemplate/body.tid
index 444aa63c0..24932c16e 100644
--- a/core/ui/EditTemplate/body.tid
+++ b/core/ui/EditTemplate/body.tid
@@ -24,9 +24,11 @@ tags: $:/tags/EditTemplate
 
 <div class="tc-tiddler-preview">
 <div class="tc-tiddler-preview-preview">
+<$set name="tv-tiddler-preview" value="yes">
 
 <$transclude />
 
+</$set>
 </div>
 
 <div class="tc-tiddler-preview-edit">
diff --git a/editions/tw5.com/tiddlers/releasenotes/Release 5.1.9.tid b/editions/tw5.com/tiddlers/releasenotes/Release 5.1.9.tid
index dc0951049..98bbd91ef 100644
--- a/editions/tw5.com/tiddlers/releasenotes/Release 5.1.9.tid	
+++ b/editions/tw5.com/tiddlers/releasenotes/Release 5.1.9.tid	
@@ -129,6 +129,7 @@ Try it out
 * [[Added|https://github.com/Jermolene/TiddlyWiki5/commit/139496209f92d229feadf5c2883edec9090c0a0a]] support for custom elements to the ButtonWidget
 * [[Improved|https://github.com/Jermolene/TiddlyWiki5/commit/d8366cc45f25d16c9085e05ee18965e626e218ff]] CodeMirror plugin to automatically refresh when a tiddler type changes
 * [[Added|https://github.com/Jermolene/TiddlyWiki5/commit/0d5033e2a00e34a7665c2cff58c0d15da224dd2b]] new setting in $:/ControlPanel to render tiddler titles as links, which can be convenient for drag and drop
+* [[Simplified|]] detecting the preview pane with the [[tv-tiddler-preview Variable]]
 
 !! Bug Fixes
 
@@ -136,12 +137,6 @@ Try it out
 * [[Fixed|https://github.com/Jermolene/TiddlyWiki5/commit/230f40c3bd71177eb7b1f7e8252a5164e99a12c5]] static banner layout on mobile devices
 * [[Fixed|https://github.com/Jermolene/TiddlyWiki5/commit/df84e932833b3643ce600499ddd5fef497bec908]] popups within the scrollable widget by adding `position: relative;` to example scrollable widget styles
 
-!! Node.js Changes
-
-//These changes are only relevant to those using TiddlyWiki under Node.js//
-
-* 
-
 !! Contributors
 
 [[@Jermolene|https://github.com/Jermolene]] would like to thank the contributors to this release who have generously given their time to help improve TiddlyWiki:
diff --git a/editions/tw5.com/tiddlers/variables/tv-wikilink-tooltip.tid copy b/editions/tw5.com/tiddlers/variables/tv-wikilink-tooltip.tid copy
new file mode 100644
index 000000000..e8fdefc07
--- /dev/null
+++ b/editions/tw5.com/tiddlers/variables/tv-wikilink-tooltip.tid copy	
@@ -0,0 +1,11 @@
+created: 20150620082727484
+modified: 20150620082727484
+title: tv-tiddler-preview Variable
+tags: Variables [[Core Variables]]
+type: text/vnd.tiddlywiki
+caption: tv-tiddler-preview
+
+The <<.def tv-tiddler-preview>> [[variable|Variables]] indicates whether content is being rendered in a tiddler preview panel.
+
+The value is ''yes'' within the preview panel, and undefined elsewhere.
+