Hi, You can update the command for ConTeXt as follows: Graphically: M-x customize-variable *↵* TeX-command-list *↵* find the appropriate section for ConTeXt commands and change it with (e.g.) "context --purgeall %t" (see attached image). Apply and save. ----------------------------- Using the init.el you can also create your own commands: (custom-set-variables '(ConTeXt-Mark-version "lmtx") '(ConTeXt-engine "lmtx")) (eval-after-load "context" '(setq TeX-command-list (append '( ("context" "context --purgeall %t" TeX-run-command t :help "Run context (lmtx)") ("luametatex" "context --purgeall %t" TeX-run-command t :help "Run context (lmtx)") ) TeX-command-list ) ) ) I hope this helps. Lizardo R.