diff --git a/json/reader.h b/json/reader.h
index 13de15c..5e4c32a 100644
--- a/json/reader.h
+++ b/json/reader.h
@@ -51,7 +51,9 @@
                   bool collectComments = true );
 
       /** \brief Read a Value from a <a HREF="http://www.json.org">JSON</a> document.
-       * \param document UTF-8 encoded string containing the document to read.
+       * \param beginDoc Pointer on the beginning of the UTF-8 encoded string of the document to read.
+       * \param endDoc Pointer on the end of the UTF-8 encoded string of the document to read. 
+       \               Must be >= beginDoc.
        * \param root [out] Contains the root value of the document if it was
        *             successfully parsed.
        * \param collectComments \c true to collect comment and allow writing them back during