Del. Code tit. 29, § 6339

Any further or special appropriations shall be known as supplementary appropriations. Every such appropriation shall be embodied in a separate bill limited to some single work, object or purpose therein stated and called herein a “Supplementary Appropriation Bill.” Each Supplementary Appropriation Bill, shall, by its provisions, provide or designate the source from which the money therein appropriated is to be derived. No Supplementary Appropriation Bill shall be passed, if when added to the appropriations already authorized, the aggregate appropriations exceed in amount the state revenues from all sources as set forth in the budget.