diff --git a/area-model-multiplication_en.html b/area-model-multiplication_en.html
index 7505597..ae16c31 100644
--- a/area-model-multiplication_en.html
+++ b/area-model-multiplication_en.html
@@ -109,6 +109,7 @@
     '../sherpa/lib/himalaya-1.1.0.js',
     '../sherpa/lib/linebreak-1.1.0.js',
     '../sherpa/lib/flatqueue-1.2.1.js',
+    '../sherpa/lib/paper-js-0.12.17.js',
     '../sherpa/lib/he-1.1.1.js',
     '../assert/js/assert.js',
     '../query-string-machine/js/QueryStringMachine.js',