Organic ferroelectrics are important materials because of their technological applications in low-cost non-volatile memory elements. Single-crystal croconic acid (C5O5H2) is the first single-component organic solid which shows room-temperature ferroelectricity. Croconic acid is a hydrogen-bonded hexagonal crystal with Pca21 symmetry. Unlike other organic ferroelectric solids, there is no distinct donor-acceptor pair to effect charge transfer, which makes it challenging to explain ferroelectricity in this material. The structure and vibrational properties of this crystal are important to understand its polarizability and ferroelectric properties. The aim of this proposal is to investigate phonon dispersion in more detail in order to gain new insights into the correlation between vibrational modes and ferroelectricity. The experimental results will be compared with DFT calculations.