The ferromagnetic resonance studies were carried out at room temperature on fine powders of Ho0.85Tb0.15Fe2Hx(x=0–3.1) and Dy0.73Tb0.27Fe2Hx(x=0–3.3) atXandQbands. Thegvalues were found to decrease with increasing hydrogen concentration in both the systems. This data along with the earlier magnetization and Mo¨ssbauer data have been used to explain the observance ofTcompin the hydrogenated samples of Ho0.85Tb0.15Fe2.