diff -r a375e31bf312 -r c1298e7ffe3a tests/traffic_lights/svgui-0@svgui/pyfile.xml
--- a/tests/traffic_lights/svgui-0@svgui/pyfile.xml	Sun Mar 05 00:38:25 2017 +0000
+++ b/tests/traffic_lights/svgui-0@svgui/pyfile.xml	Fri Mar 24 12:07:47 2017 +0000
@@ -2,18 +2,31 @@
 <PyFile xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <variables/>
   <globals>
-    <xhtml:p><![CDATA[]]></xhtml:p>
+    <xhtml:p><![CDATA[
+/*
+    Web interface is build as SVG file in Inkscape. 
+    To edit SVG file click 'Inkscape' button on the toolbar above.
+    
+    Inkscape is a free and open-source vector graphics editor. 
+    It's not part of Beremiz and needs to be installed separately.
+*/
+
+]]></xhtml:p>
   </globals>
   <init>
-    <xhtml:p><![CDATA[]]></xhtml:p>
+    <xhtml:p><![CDATA[
+]]></xhtml:p>
   </init>
   <cleanup>
-    <xhtml:p><![CDATA[]]></xhtml:p>
+    <xhtml:p><![CDATA[
+]]></xhtml:p>
   </cleanup>
   <start>
-    <xhtml:p><![CDATA[]]></xhtml:p>
+    <xhtml:p><![CDATA[
+]]></xhtml:p>
   </start>
   <stop>
-    <xhtml:p><![CDATA[]]></xhtml:p>
+    <xhtml:p><![CDATA[
+]]></xhtml:p>
   </stop>
 </PyFile>