diff --git a/_includes/machine-engines.html b/_includes/machine-engines.html
index f35dc8290..51951229a 100644
--- a/_includes/machine-engines.html
+++ b/_includes/machine-engines.html
@@ -26,6 +26,7 @@ The following optional machine properties will be added to the 'parms' property:
     'drives' (eg, '[{name:"68Mb Hard Disk",type:4,path:"http://archive.pcjs.org/disks/pc/fixed/68mb/win95.json"}]')
     'state' (eg, "state.json")
     'messages' (eg, "fault")
+    'connection' (eg, "serialPort=vt100a.serialPort")
 
 Finally, all our JavaScript components expect multi-word property names to use camelCase, so we automatically convert
 any lower-case forms to camelCase, both here and in markout.js and components.xsl, in case we've gotten sloppy in any
@@ -97,7 +98,7 @@ of our Markdown or XML documents.  Examples: 'automount' becomes 'autoMount', 'a
   {% else %}
     {% assign machine_template = machine.template %}
   {% endunless %}
-  {% capture machine_parms %}{{ site.left_brace }}autoMount:{{ machine_autoMount }}{{ machine_autoPower }}{{ machine_autoStart }}{{ machine_drives }},state:"{{ machine.state }}",messages:"{{ machine.messages }}"{{ site.right_brace }}{% endcapture %}
+  {% capture machine_parms %}{{ site.left_brace }}autoMount:{{ machine_autoMount }}{{ machine_autoPower }}{{ machine_autoStart }}{{ machine_drives }},state:"{{ machine.state }}",messages:"{{ machine.messages }}",connection:"{{ machine.connection }}"{{ site.right_brace }}{% endcapture %}
   {% if site.pcjs.compiled == true and machine.uncompiled != true %}
     {% capture machine_script %}<script type="text/javascript" src="{{ site.baseurl }}/versions/{{ machine_app }}/{{ site.pcjs.version }}/{{ machine_file }}.js"></script>{% endcapture %}
     {% unless machine_scripts contains machine_script %}