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26.6.3 Emacs Lisp Documentation Lookup

When editing Emacs Lisp code, you can use the commands C-h f (describe-function) and C-h v (describe-variable) to view the built-in documentation for the Lisp functions and variables that you want to use. See Name Help.

Eldoc is a buffer-local minor mode that helps with looking up Lisp documention. When it is enabled, the echo area displays some useful information whenever there is a Lisp function or variable at point; for a function, it shows the argument list, and for a variable it shows the first line of the variable's documentation string. To toggle Eldoc mode, type M-x eldoc-mode. Eldoc mode can be used with the Emacs Lisp and Lisp Interaction major modes.