diff --git a/framework/web/helpers/CJavaScriptExpression.php b/framework/web/helpers/CJavaScriptExpression.php
index 2a408b5e7..21ba68a73 100644
--- a/framework/web/helpers/CJavaScriptExpression.php
+++ b/framework/web/helpers/CJavaScriptExpression.php
@@ -30,7 +30,7 @@ class CJavaScriptExpression
 	public function __construct($code)
 	{
 		if(!is_string($code))
-			throw new CException('Value passed to CJavaScriptExpression should be string.');
+			throw new CException('Value passed to CJavaScriptExpression should a be string.');
 		$this->code=$code;
 	}