diff --git a/rutherford-scattering_en.html b/rutherford-scattering_en.html
index 06f31d5..c895a55 100644
--- a/rutherford-scattering_en.html
+++ b/rutherford-scattering_en.html
@@ -95,6 +95,7 @@
     '../sherpa/lib/lodash-4.17.4.js',
     '../sherpa/lib/FileSaver-b8054a2.js',
     '../sherpa/lib/himalaya-1.1.0.js',
+    '../sherpa/lib/flatqueue-1.2.1.js',
     '../sherpa/lib/he-1.1.1.js',
     '../assert/js/assert.js',
     '../query-string-machine/js/QueryStringMachine.js',