customize-push-and-savecustomize-push-and-save is an autoloaded compiled Lisp function in `
cus-edit.el'. (customize-push-and-save LIST-VAR ELTS) Add ELTS to LIST-VAR and save for future sessions, safely. ELTS should be a list. This function adds each entry to the value of LIST-VAR using `add-to-list'. If Emacs is initialized, call `customize-save-variable' to save the resulting list value now. Otherwise, add an entry to `after-init-hook' to save it after initialization.