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diff --git a/grc/blocks/parameter.xml b/grc/blocks/parameter.xml
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+<?xml version="1.0"?>
+<!--
+###################################################
+##Parameter block: a grc variable with key, value
+###################################################
+ -->
+<block>
+	<name>Parameter</name>
+	<key>parameter</key>
+	<var_make>self.$(id) = $(id)</var_make>
+	<make>$value</make>
+	<param>
+		<name>Label</name>
+		<key>label</key>
+		<value></value>
+		<type>string</type>
+		<hide>#if $label() then 'none' else 'part'#</hide>
+	</param>
+	<param>
+		<name>Value</name>
+		<key>value</key>
+		<value>0</value>
+		<type>$type.type</type>
+	</param>
+	<param>
+		<name>Type</name>
+		<key>type</key>
+		<value></value>
+		<type>enum</type>
+		<hide>#if $type() then 'none' else 'part'#</hide>
+		<option>
+			<name>None</name>
+			<key></key>
+			<opt>type:raw</opt>
+		</option>
+		<option>
+			<name>Complex</name>
+			<key>complex</key>
+			<opt>type:complex</opt>
+		</option>
+		<option>
+			<name>Float</name>
+			<key>eng_float</key>
+			<opt>type:real</opt>
+		</option>
+		<option>
+			<name>Int</name>
+			<key>intx</key>
+			<opt>type:int</opt>
+		</option>
+		<option>
+			<name>Long</name>
+			<key>long</key>
+			<opt>type:int</opt>
+		</option>
+		<option>
+			<name>String</name>
+			<key>string</key>
+			<opt>type:string</opt>
+		</option>
+		<!-- not supported yet in tmpl
+		<option>
+			<name>Boolean</name>
+			<key>bool</key>
+			<opt>type:bool</opt>
+		</option>
+		-->
+	</param>
+	<param>
+		<name>Short ID</name>
+		<key>short_id</key>
+		<value></value>
+		<type>string</type>
+		<hide>#if not $type()
+all#slurp
+#elif $short_id()
+none#slurp
+#else
+part#slurp
+#end if</hide>
+	</param>
+	<check>len($short_id) in (0, 1)</check>
+	<check>$short_id == '' or $(short_id).isalpha()</check>
+	<doc>
+This block represents a parameter to the flow graph. \
+A parameter can be used to pass command line arguments into a top block. \
+Or, parameters can pass arguments into an instantiated hierarchical block.
+
+The paramater value cannot depend on any variables.
+
+Leave the label blank to use the parameter id as the label.
+
+When type is not None, this parameter also becomes a command line option of the form:
+
+-[short_id] --[id] [value]
+
+The Short ID field may be left blank.
+	</doc>
+</block>