V509 Cas is one of the rare evolved massive stars known as yellow hypergiants. These stars are in an unstable phase of evolution, during which their atmospheres undergo recurring outbursts. Over the 20th century, V509 Cas went through multiple eruptive mass-loss episodes, during which its temperature, luminosity and other physical parameters changed rapidly. At the beginning of the 21st century, the behaviour of V509 Cas suddenly changed and the star started to show signs of reaching a more stable phase of evolution. Using the FIbre-fed Echelle Spectrograph (FIES) at the Nordic Optical Telescope, we have explored the surface movements of the star to get a glimpse of its circumstellar environment and we have found confirmation to the hypothesis of a disc surrounding the star.