Dear Mr. / Ms. / Mrs. (Name of the concerned person),
I want to appreciate you on behalf of (mention the name of your company) regarding your excellent performance in (name the project) which has been announced yesterday evening. You have done brilliant work and I am very much satisfied with your working style. You have set an example for every employee of (Name your company).
Due to your good output by achieving given targets, the management has decided to give you increment. Please find herewith the enclosed increment letter as your reward. I remember the day, when you joined us on (mention the date or time of joining) as a trainee but you have continuously proved your capability with in a short span of time. I heartily congratulate you and expect the same performance in upcoming years.
If you have any questions regarding your next month targets and increment amount, feel free to contact me via mailer. (Mention phone number and mail id)