Voters in Cape Elizabeth and Falmouth will consider multimillion-dollar proposals on Tuesday to upgrade their public libraries.

In Cape Elizabeth, the referendum would authorize town officials to borrow $4 million and spend as much as $4.2 million to renovate and expand the Thomas Memorial Library. The library foundation would raise $500,000 for new furnishings and equipment.

In Falmouth, the referendum would authorize town officials to borrow as much as $2.8 million to cover half of the estimated $5.6 million cost to renovate and expand the Falmouth Memorial Library. The library association is expected to raise the balance.