added link for encryption key in Session class to the explanation in the Encryption lib
diff --git a/user_guide/libraries/sessions.html b/user_guide/libraries/sessions.html
index 7dc386f..a8e3b34 100644
--- a/user_guide/libraries/sessions.html
+++ b/user_guide/libraries/sessions.html
@@ -69,7 +69,7 @@
generates its own session data, offering more flexibility for developers.</p>
<p class="important"><strong>Note:</strong> Even if you are not using encrypted sessions, you must set
-an encryption key in your config file which is used to aid in preventing session data manipulation.</p>
+an <a href="./encryption.html">encryption key</a> in your config file which is used to aid in preventing session data manipulation.</p>
<h2>Initializing a Session</h2>