Added manual information about deadline extensions and automatic reopening of tasks.

diff --git a/GHOPUserManual.wiki b/GHOPUserManual.wiki
index 08a28d0..3c1c85c 100644
--- a/GHOPUserManual.wiki
+++ b/GHOPUserManual.wiki

@@ -49,6 +49,8 @@
 
   A student is one who can claim a task, work on it, submit his work and win prizes.
 
+  * If student submits no work and the initial deadline passes, the deadline is automatically extended for another 24 hours. This shoots a mail to all the subscribers to the task notifying about the deadline extension. The task of the status is set to ActionNeeded. If the student fails to submit any work in that extended deadline of 24 hours also, the task is automatically re-opened. To learn how to subscribe to the task read the Rules of subscription below.
+
 == Public ==
 
   Any user. Every such user is differentiated as a logged-in or non-logged-in user.