diff --git a/catalog/fgaddon-catalog-ukmirror/template.xml b/catalog/fgaddon-catalog-ukmirror/template.xml
index f878fc8..d13b97e 100644
--- a/catalog/fgaddon-catalog-ukmirror/template.xml
+++ b/catalog/fgaddon-catalog-ukmirror/template.xml
@@ -1,10 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <PropertyList>
   <template>
+    <!-- if we break trunk compat in a substantial way, consider removing these -->
 	  <version n="0">2019.*</version>
 	  <version n="1">2018.*</version>
 	  <version n="2">2020.1.*</version>
 	  <version n="3">2020.2.*</version>
+   	
+     <version n="4">2020.3.*</version>
 
     <id>org.flightgear.fgaddon.trunk</id>
     <license>GPL</license>