diff --git a/README.md b/README.md
index 26977c1..70a6b71 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,15 @@
 # Cron
 
-An overview of using Ubuntu's built in Cron system.
\ No newline at end of file
+An overview of using Ubuntu's built in Cron system.
+```
+[minute] [hour] [day_of_month] [month] [day_of_week] [user] [command_to_run]
+* * * * * root /root/update.sh
+```
+
+| Field | Values allowed |
+| --- | --- |
+| Minute | 0 to 59 |
+| Hour | 0 to 23 |
+| Day of month | 1 to 31 |
+| Month | 1 to 12 OR JAN to DEC |
+| Day of week | 0 to 6 OR SUN to SAT |
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