A recent study explores how the Sachs-Wolfe (SW) effect, known for its influence on the cosmic microwave background (CMB), also affects cosmological gravitational waves (GWs). This effect, arising from large-scale structures in the universe, modifies the frequencies of GWs, imprinting anisotropies and spectral distortions. Researchers show that for GW backgrounds with an energy density of $\Omega_{\rm GW}\gtrsim 10^{-10}$, these imprints could be detectable with networks of space-based interferometers, such as LISA and Taiji.