diff --git a/lib/WebGUI/Macro/RenderThingData.pm b/lib/WebGUI/Macro/RenderThingData.pm
index d5d1d723c..4768c3715 100644
--- a/lib/WebGUI/Macro/RenderThingData.pm
+++ b/lib/WebGUI/Macro/RenderThingData.pm
@@ -23,7 +23,7 @@ Package WebGUI::Macro::RenderThingData
 
 Macro that allows users to render thing data.
 
-=head2 process ( thingURL, templateHint )
+=head2 process ( thingURL, templateHint, callerAssetId )
 
 =head3 thingHint
 
@@ -33,6 +33,11 @@ The URL from which to pull the thingId and thingDataId
 
 Optional.  Specifies the templateId or template url to use.  If omitted, the default thingy view template will be used.
 
+=head3 callerAssetId
+
+Optional.  Passes an assetId to the template (as a template var named callerAssetId) so that the the assetId of of
+the caller can be known by the called template.  Generally you should pass <tmpl_var assetId>.
+
 =cut
 
 
diff --git a/t/Macro/RenderThingData.t b/t/Macro/RenderThingData.t
index 3053035f5..246f8b7c8 100644
--- a/t/Macro/RenderThingData.t
+++ b/t/Macro/RenderThingData.t
@@ -39,7 +39,7 @@ WebGUI::Test->addToCleanup(sub {
     WebGUI::Test->unmockAssetUrl($templateUrl);
 });
 
-plan tests => 6;
+plan tests => 7;
 
 my $node = WebGUI::Asset->getImportNode($session);
 my $versionTag = WebGUI::VersionTag->getWorking($session);
@@ -119,3 +119,6 @@ $output = WebGUI::Macro::RenderThingData::process($session, $thing_url, $templat
 ok $templateProcessed, '... passed template url, template processed';
 $templateProcessed = 0;
 
+$output = WebGUI::Macro::RenderThingData::process($session, $thing_url, $templateUrl, "fakeAssetId");
+ok $templateVars->{'callerAssetId'} eq 'fakeAssetId', '... passed callerAssetId, template var was passed';
+$templateProcessed = 0;