diff --git a/user_guide/libraries/sessions.html b/user_guide/libraries/sessions.html
index a8e3b34..3bd170d 100644
--- a/user_guide/libraries/sessions.html
+++ b/user_guide/libraries/sessions.html
@@ -190,12 +190,14 @@
 <h2>Saving Session Data to a Database</h2>
 <p>While the session data array stored in the user's cookie contains a Session ID,
 unless you store session data in a database there is no way to validate it.  For some applications that require little or no
-security, session ID validation may not be needed, but if your application requires security, validation is mandatory.</p>
+security, session ID validation may not be needed, but if your application requires security, validation is mandatory.  Otherwise, an old session
+could be restored by a user modifying their cookies.</p>
 
 <p>When session data is available in a database, every time a valid session is found in the user's cookie, a database
 query is performed to match it.  If the session ID does not match, the session is destroyed.  Session IDs can never
 be updated, they can only be generated when a new session is created.</p>
 
+
 <p>In order to store sessions, you must first create a database table for this purpose.  Here is the basic
 prototype (for MySQL) required by the session class:</p>