Add some comments

lib/util.js

@@ -5,6 +5,8 @@ var servers = require('../servers.json');
 
 var serverNameLookup = {};
 
+// Finds a server in servers.json with a matching IP.
+// If it finds one, it caches the result for faster future lookups.
 function getServerNameByIp(ip) {
 	var lookupName = serverNameLookup[ip];
 
@@ -23,6 +25,7 @@ function getServerNameByIp(ip) {
 	}
 }
 
+// Returns a list of configured server IPs from servers.json
 function getServerIps() {
 	var ips = [];