diff --git a/source/org/otherone/vhostproxy/vertx/config.ceylon b/source/org/otherone/vhostproxy/vertx/config.ceylon
index a163da6..d7097a2 100644
--- a/source/org/otherone/vhostproxy/vertx/config.ceylon
+++ b/source/org/otherone/vhostproxy/vertx/config.ceylon
@@ -37,7 +37,7 @@ shared object portConfig {
     shared Integer publicHttpsPort = listenHttpsPort;
 }
 
-"A file containing 'group:commaSeparatedListOfIps'. Example: 'home:192.168.1.2,127.0.0.1'. IPv6 addresses also allowed."
+"A file containing 'group:commaSeparatedListOfIps'. Example: 'home:192.168.1.2,127.0.0.1'. IPv6 addresses also allowed in uncompressed format e.g. 0:0:0:0:0:0:0:1 for localhost."
 String accessGroupFilename = "accessGroups.txt";
 
 class NextHop (