The paper discusses the phenomenon of ferroelectricity in spiral magnets, a class of materials that exhibit strong interplay between magnetism and ferroelectricity. The authors present a phenomenological theory to describe the orientation of induced electric polarization in various incommensurate magnetic states, its dependence on temperature and magnetic field, and anomalies in dielectric susceptibility at magnetic transitions. They show that electric polarization can be induced at domain walls and that magnetic vortices carry electric charge. The theory is based on general symmetry arguments and a simple continuum model, which clarifies the relationship between induced electric polarization and magnetic structure. The paper also explains the sinusoidal-helicoidal transition in these materials, where the induced polarization is only present in the helicoidal state. Additionally, it discusses the behavior of electric polarization in magnetic fields, highlighting the sensitivity of dielectric properties to magnetic fields, which can suppress or change the direction of electric polarization. The findings are supported by numerical calculations and are relevant for technological applications, particularly in materials with high ordering temperatures.The paper discusses the phenomenon of ferroelectricity in spiral magnets, a class of materials that exhibit strong interplay between magnetism and ferroelectricity. The authors present a phenomenological theory to describe the orientation of induced electric polarization in various incommensurate magnetic states, its dependence on temperature and magnetic field, and anomalies in dielectric susceptibility at magnetic transitions. They show that electric polarization can be induced at domain walls and that magnetic vortices carry electric charge. The theory is based on general symmetry arguments and a simple continuum model, which clarifies the relationship between induced electric polarization and magnetic structure. The paper also explains the sinusoidal-helicoidal transition in these materials, where the induced polarization is only present in the helicoidal state. Additionally, it discusses the behavior of electric polarization in magnetic fields, highlighting the sensitivity of dielectric properties to magnetic fields, which can suppress or change the direction of electric polarization. The findings are supported by numerical calculations and are relevant for technological applications, particularly in materials with high ordering temperatures.