RoadMap.md

@@ -37,6 +37,7 @@ Longer term projects
   + stochastic simulations approach à la Judd, Maliar and Maliar (2011, Quant. Econ.) (#162)
 
 * Heterogeneous Agents New-Keynesian (HANK) models
+  + perturbation method with dimensionality reduction à la Winberry (2018, Quant. Econ.)
   + sequence-space Jacobian à la Auclerc et al. (2021, Econometrica)
 
 * Markov-switching DSGE à la [RISE](https://github.com/jmaih/RISE_toolbox)