diff --git a/source/jabber/index.html.slim b/source/jabber/index.html.slim
index e7c4fa5..103dbc5 100644
--- a/source/jabber/index.html.slim
+++ b/source/jabber/index.html.slim
@@ -20,6 +20,13 @@ table.pure-table.pure-table-bordered summary="Connection information"
       ' (to send files)
     td proxy.higgsboson.tk:5000
 
+p
+  ' We use certificate from
+  a href="http://www.cacert.org/" cacert
+  '  on our server. Install theire root certificate from
+  a href="http://www.cacert.org/index.php?id=3" here
+  '  to avoid certificate validation errors
+
 p
   ' Don't have a jabber client?
   ' Just visit our