diff --git a/js/ph-scale-basics-main.js b/js/ph-scale-basics-main.js
index 4473de7..d02bcc1 100644
--- a/js/ph-scale-basics-main.js
+++ b/js/ph-scale-basics-main.js
@@ -1,4 +1,4 @@
-// Copyright 2013-2019, University of Colorado Boulder
+// Copyright 2013-2020, University of Colorado Boulder
 
 /**
  * Main entry point for the 'pH Scale: Basics' sim.