diff --git a/src/iiiftilesource.js b/src/iiiftilesource.js
index fc711738..cb64abe9 100644
--- a/src/iiiftilesource.js
+++ b/src/iiiftilesource.js
@@ -32,6 +32,13 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+/*
+ * The getTileUrl implementation is based on Jon Stroop's Python version,
+ * which is released under the New BSD license:
+ * https://gist.github.com/jpstroop/4624253
+ */
+
+
 (function( $ ){
     
 /**
@@ -39,9 +46,6 @@
  * Format: Image API Draft 0.2 - Please read more about the specification
  * at 
  *
- * The getTileUrl implementation is based on the gist from:
- * https://gist.github.com/jpstroop/4624253
- *
  * @class
  * @extends OpenSeadragon.TileSource
  * @see http://library.stanford.edu/iiif/image-api/