Some company do not allow employee to involve directly or indirectly in any business activity others than the company's official matter.
And I just found out a friend of mine actually started a business without the knowledge of her company HR.
Opps...I hope she knows what she is doing! it could lead to 24 hours notice as I understand from her.
She would better keep it very very very secretive. Better take care, I would advice you acknowledge your HR with a copy of your business partnership certificate before it is too late, somwtimes, it is good to do thing legally by following to proper procedure, don't you think?
Good Luck to You, and hope you business groommmm...!
Sincerely from me! :)