For good measure
Definition 1 of 1
Pro Tip 1/3Extra Touch
Use it when adding something non-essential but nice to have for enhancement or emphasis. 
I put extra frosting on the cake, and sprinkles for good measure.
Pro Tip 2/3Generosity
It implies giving more than what is standard or expected, showing generosity or abundance. 
He gave the employees a bonus, and a day off for good measure.
Pro Tip 3/3Emphasis Added
It can also be used to stress a point or make an argument stronger. 
She doubled-checked all the doors were locked, and the windows for good measure.