diff --git a/lib/types/index.js b/lib/types/index.js
index b731433c..0750856c 100644
--- a/lib/types/index.js
+++ b/lib/types/index.js
@@ -13,6 +13,8 @@ var noParse = function(val) {
 
 //returns a function used to convert a specific type (specified by
 //oid) into a result javascript type
+//note: the oid can be obtained via the following sql query:
+//SELECT oid FROM pg_type WHERE typname = 'TYPE_NAME_HERE';
 var getTypeParser = function(oid, format) {
   if (!typeParsers[format]) {
     return noParse;