Recent and ongoing research shows that atmospheric radiative feedbacks depend on changes in sea-surface temperature patterns (“pattern effect”) and global mean temperature (“feedback temperature dependence”). This implies that feedbacks can change as warming patterns and global temperature evolve over time, counter to what has been assumed for decades. This realization has led to a proliferation of feedback definitions and methods to estimate equilibrium climate sensitivity (ECS). In a recent Geophysics Research Letters paper, Rugenstein and Armour contrast the equilibrium, effective, and differential feedback parameter definitions and discuss their physical interpretations and applications. Importantly, these feedback definitions imply different values of effective or equilibrium climate sensitivity.