diff --git a/ratio-and-proportion_en.html b/ratio-and-proportion_en.html
index a9042f60..9722a6e6 100644
--- a/ratio-and-proportion_en.html
+++ b/ratio-and-proportion_en.html
@@ -52,7 +52,8 @@
           "phet",
           "phet-io",
           "adapted-from-phet"
-        ]
+        ],
+        "supportsOutputJS": true
       },
       "eslintConfig": {
         "extends": "../chipper/eslint/sim_eslintrc.js"