diff --git a/index.js b/index.js
index 31d272f..4292de7 100644
--- a/index.js
+++ b/index.js
@@ -130,6 +130,10 @@ forEach(Object_keys(Script.prototype), function (name) {
     };
 });
 
+exports.isContext = function (context) {
+    return context instanceof Context;
+};
+
 exports.createScript = function (code) {
     return exports.Script(code);
 };