This package overlays doc-strings (typically from C/C++ headers). ; Usage Write the following code to your .emacs file: (require 'doc-show-inline) Or with `use-package': (use-package doc-show-inline) If you prefer to enable this per-mode, you may do so using mode hooks instead of calling `doc-show-inline-mode'. The following example enables this for C-mode: (add-hook 'c-mode-hook (lambda () (doc-show-inline-mode)))