diff --git a/scripts/index.php b/scripts/index.php
index 39d27fe..9fd6775 100644
--- a/scripts/index.php
+++ b/scripts/index.php
@@ -106,6 +106,7 @@
 		shell_exec('sudo shutdown -h now 2>&1 & echo $!');
 	    }
 	    ?>
+	    Read the <a href="https://gumroad.com/l/linux-photography">Linux Photography</a> book
 	</div>
     </body>
 </html>
diff --git a/scripts/sysinfo.php b/scripts/sysinfo.php
index 11f24a0..83c9eb7 100644
--- a/scripts/sysinfo.php
+++ b/scripts/sysinfo.php
@@ -48,6 +48,7 @@
 	    <form>
 		<input type="button" onClick="history.go(0)" value="Refresh">
 	    </form>
+	    <p>Read the <a href="https://gumroad.com/l/linux-photography">Linux Photography</a> book</p>
 	</div>
     </body>
 </html>