diff --git a/flow/hstore/hstore.go b/flow/hstore/hstore.go
index 915c05269e..fca712abec 100644
--- a/flow/hstore/hstore.go
+++ b/flow/hstore/hstore.go
@@ -1,3 +1,9 @@
+/*
+This is in reference to PostgreSQL's hstore:
+https://github.com/postgres/postgres/blob/bea18b1c949145ba2ca79d4765dba3cc9494a480/contrib/hstore/hstore_io.c
+
+This package is an implementation of the above code.
+*/
 package hstore_util
 
 import (