In a joint work with Daren Chen and Ian Zemke, we study the torsion order of Heegaard Floer homology under L-space satellite operators, which by a result by Alishahi-Eftekhary, leads to an unknotting number bound. The argument resembles the work of Hom-Lidman-Park; instead of using immersed curves, we use the L-space satellite formula by Chen-Zemke-Zhou.