diff --git a/Net/include/Poco/Net/HTTPCookie.h b/Net/include/Poco/Net/HTTPCookie.h
index ceca6a0b9..8a859be9b 100644
--- a/Net/include/Poco/Net/HTTPCookie.h
+++ b/Net/include/Poco/Net/HTTPCookie.h
@@ -141,8 +141,10 @@ public:
 		/// Sets the maximum age in seconds for
 		/// the cookie.
 		///
-		/// A value of -1 causes the cookie to
-		/// never expire on the client.
+		/// A value of -1 (default) causes the cookie 
+		/// to become a session cookie, which will
+		/// be deleted when the browser window
+		/// is closed.
 		///
 		/// A value of 0 deletes the cookie on
 		/// the client.