Is the below resignation correct? Thanks

My stay with the company for five years has been a very worthwhile experience. However, I've reached the crossroad of my life wherein I have to move on and explore other avenues back home.

I am tendering my irrevocable resignation effective today 3rd March 2015, and this letter will serve as one month notice.

I would like to express my deepest gratitude with all the help, support, understanding, opportunities and kindness you have extended me all these years.