In the present work, we study the vortex-induced vibrations of an elastically mounted cylinder with a flexible splitter plate in its wake. Two splitter plate flexural rigidities have been investigated with splitter plate length of 2D (D is the diameter), one where the plate is completely rigid (EI/ \(b \xrightarrow \infty \) ), while in the other case, the plate is flexible with flexural rigidity (per unit width), EI/ \(b=5.5\times 10^{-6}\) Nm. The experiments are done in a water tunnel at low mass and damping values of \(m^*\) = 5.98 and \(\zeta \) = 0.0038 over a range of reduced velocities from \(U^*\) = 4 to 10. Cylinder response, flexible splitter plate deformations, and forces on the cylinder have been measured, for both the splitter plate cases, and a reference case of a bare cylinder. The differences in cylinder response and forces on the cylinder between the cases are highlighted, and a more systematic study of splitter plate flexural rigidity on the cylinder response is presently being undertaken.