Install elpa-hl-todo by entering the following commands in the terminal:
sudo apt update sudo apt install elpa-hl-todo
Description:
highlight TODO and similar keywords in comments and strings
This package provides minor mode to highlight TODO and similar keywords in comments and strings. . Also this package provides commands for moving to the next or previous keyword and to invoke `occur' with a regexp that matches all known keywords.
Homepage: https://github.com/tarsius/hl-todo
Version: 1.8.0-1
Section: universe/lisp