diff --git a/src/ajax.js b/src/ajax.js
index 8a1b8b623..caffe883d 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -44,6 +44,7 @@ var
 	// Avoid comment-prolog char sequence (#10098); must appease lint and evade compression
 	allTypes = "*/".concat("*");
 
+// Support: IE<8
 // #8138, IE may throw an exception when accessing
 // a field from window.location if document.domain has been set
 try {