diff --git a/src/util/bsearch.scad b/src/util/bsearch.scad
index 45f9b809..1621afa1 100644
--- a/src/util/bsearch.scad
+++ b/src/util/bsearch.scad
@@ -1,3 +1,13 @@
+/**
+* bsearch.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-bsearch.html
+*
+**/
+
 use <util/_impl/_bsearch_impl.scad>;
 
 function bsearch(sorted, elem, by = "idx", idx = 0) =