Whenever a majority of the electors voting at a bond election in any municipality, as the same is defined in Kan. Stat. Ann. § 10-1101, shall vote in favor of the issuance of bonds of such municipality for the purpose of providing funds for the purchase or acquisition of a site and the construction thereon of a new public library building, and prior thereto, under the authority of and in compliance with Kan. Stat. Ann. § 79-4001, said municipality has levied taxes and created and provided a special fund to be used to remodel, construct, reconstruct, furnish and equip an addition or annex to the library then being operated and maintained by said municipality, and said moneys in such special fund have not been expended for the purpose for which originally levied or appropriated, then, all moneys theretofore or thereafter credited to such special fund shall be used to supplement the moneys derived from the issuance of the bonds for the purchase or acquisition of a site and the construction thereon of a new public library building or may be used to furnish and equip such new library: Provided, That the notice of the bond election for the issuance of bonds for such new public library building and the question on the ballot used at such bond election shall state that all moneys theretofore or thereafter credited to said special fund will be used to supplement the moneys derived from the issuance of the bonds or to furnish and equip the new library building.