diff --git a/core/language/en-GB/Help/rendertiddler.tid b/core/language/en-GB/Help/rendertiddler.tid
index 60b3af0b9..f4508fb5e 100644
--- a/core/language/en-GB/Help/rendertiddler.tid
+++ b/core/language/en-GB/Help/rendertiddler.tid
@@ -1,12 +1,22 @@
 title: $:/language/Help/rendertiddler
 description: Render an individual tiddler as a specified ContentType
 
-Render an individual tiddler as a specified ContentType, defaulting to `text/html` and save it to the specified filename. Optionally a template can be specified, in which case the template tiddler is rendered with the "currentTiddler" variable set to the tiddler that is being rendered (the first parameter value).
+Render an individual tiddler as a specified ContentType, defaulting to `text/html` and save it to the specified filename.
+
+Optionally the title of a template tiddler can be specified, in which case the template tiddler is rendered with the "currentTiddler" variable set to the tiddler that is being rendered (the first parameter value).
+
+A name and value for an additional variable may optionally also be specified.
 
 ```
---rendertiddler <title> <filename> [<type>] [<template>]
+--rendertiddler <title> <filename> [<type>] [<template>] [<name>] [<value>]
 ```
 
 By default, the filename is resolved relative to the `output` subdirectory of the edition directory. The `--output` command can be used to direct output to a different directory.
 
 Any missing directories in the path to the filename are automatically created.
+
+For example, the following command saves all tiddlers matching the filter `[tag[done]]` to a JSON file titled `output.json` by employing the core template `$:/core/templates/exporters/JsonFile`.
+
+```
+--rendertiddler "$:/core/templates/exporters/JsonFile" output.json text/plain "" exportFilter "[tag[done]]"
+```
diff --git a/core/modules/commands/rendertiddler.js b/core/modules/commands/rendertiddler.js
index 22f6c1ecc..1860beb7e 100755
--- a/core/modules/commands/rendertiddler.js
+++ b/core/modules/commands/rendertiddler.js
@@ -34,12 +34,17 @@ Command.prototype.execute = function() {
 		filename = path.resolve(this.commander.outputPath,this.params[1]),
 		type = this.params[2] || "text/html",
 		template = this.params[3],
+		name = this.params[4],
+		value = this.params[5],
 		variables = {};
 	$tw.utils.createFileDirectories(filename);
 	if(template) {
 		variables.currentTiddler = title;
 		title = template;
 	}
+	if(name && value) {
+		variables[name] = value;
+	}
 	fs.writeFile(filename,this.commander.wiki.renderTiddler(type,title,{variables: variables}),"utf8",function(err) {
 		self.callback(err);
 	});