Preheat oven to 350 . Sift the cake mix and pudding mix together. Helps avoid lumps
Follow the instructions on the back of the cake mix box. Adding the required water,eggs, oil
Mix in the cinnamon and rum. You can add more of either. Do whatever makes you happy :)
Bake for 1 hour (or until toothpick comes out clean) in a well greased and floured bundt pan. Let cool for 10 min and invert. The cake will turn out very moist. I do not glaze or frost it because it's so good it stands on it's own.