add cron job definition

diff --git a/en/manual.xml b/en/manual.xml
index f38a6ad..87caffd 100644 (file)
--- a/en/manual.xml
+++ b/en/manual.xml
@@ -41966,7 +41966,12 @@ print theme('pages_catalog');</programlisting>
   <chapter id="cronjobsch">
     <title>Cron Jobs</title>
 
-    <para/>
+    <para>A cron job is a Linux command for scheduling a command or script on your server to
+      complete repetitive tasks automatically. Scripts executed as a cron job are typically used to
+      modify files or databases; however, they can perform other tasks that do not modify data on
+      the server, like sending out email notifications. Koha has many cron jobs in place that you
+      can enable (search engine indexing, overdue notice generation, data cleanup and more), this
+      chapter will explain those for you.</para>
 
     <section id="cronjobs">
       <title>Cron Jobs</title>