updated readme

README.md

@@ -10,15 +10,28 @@ Open your crontab.
 
 $ crontab -e
 
-Add the folowing line to check battery status every minute
+Add the following line to check battery status every minute
 
 */1 * * * * /PATH/TO/YOUR/SCRIPT/i3batwarn.sh
 
+If the need to trouble shoot arises one could pipe the cron job output to a file like
+
+*/1 * * * * /PATH/TO/YOUR/SCRIPT/i3batwarn.sh > /tmp/batterywarn.log
+
+If the script only works when invoked from terminal and not as a cronjob it might help to specify
+
+DISPLAY=:0
+
+in the cron tab (before calling this script).
+
+screenshot
+==========
+
+![ScreenShot](screenshot.png)
+
 fork changes
 ============
 
-added a pidfile where the pid of each (one max) nagbar is saved
-
+Added a pidfile where the pid of each (one max) nagbar is saved
 and a check to kill the nagbar if the battery is above the limit.
-
-> this usually works but sometimes the nagbar has to be closed manually
+This usually works but sometimes the nagbar has to be closed manually.