diff --git a/balloons-and-static-electricity-tests.html b/balloons-and-static-electricity-tests.html
index 9a13eb56..28094fc4 100644
--- a/balloons-and-static-electricity-tests.html
+++ b/balloons-and-static-electricity-tests.html
@@ -47,6 +47,7 @@
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diff --git a/balloons-and-static-electricity_en.html b/balloons-and-static-electricity_en.html
index f6d45d75..711320be 100644
--- a/balloons-and-static-electricity_en.html
+++ b/balloons-and-static-electricity_en.html
@@ -46,6 +46,7 @@
           "adapted-from-phet"
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+        "supportsSound": true,
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diff --git a/package.json b/package.json
index 6f204478..51659390 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
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