diff --git a/website/function.json b/website/function.json
index 21f9b972..281b17ca 100644
--- a/website/function.json
+++ b/website/function.json
@@ -69,6 +69,7 @@
     "isEmpty",
     "isNil",
     "isNumber",
+    "isBoolean",
     "isObject",
     "isString",
     "isUndefined",