Update gindex.js

Author: aureooms

js/src/001 undirected/online/data/gindex.js

@@ -1,3 +1,10 @@
+/**
+ * Sparse graph wrapper indexing vertices allowing
+ * direct reference to a matrix (dense) structure.
+ * 
+ */
+
+
 var index_t = function(){
 
 	var index = function(G, attr){
@@ -57,4 +64,4 @@ var index_t = function(){
 
 };
 
-exports.index_t = index_t;
+exports.index_t = index_t;