diff --git a/themes/contribute.jquery.org/functions.php b/themes/contribute.jquery.org/functions.php
new file mode 100644
index 00000000..3c94ddef
--- /dev/null
+++ b/themes/contribute.jquery.org/functions.php
@@ -0,0 +1,8 @@
+<?php
+ 
+// Allow loading a Vimeo video on
+// https://local.contribute.jquery.org/markup-conventions/
+add_filter( 'jq_content_security_policy', function ( $policy ) {
+	$policy[ 'frame-src' ] = "'self' player.vimeo.com";
+	return $policy;
+} );