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### 24.4 Convenience Features for Indentation

The variable `tab-always-indent` tweaks the behavior of the `TAB` (`indent-for-tab-command`) command. The default value, `t`, gives the behavior described in Indentation. If you change the value to the symbol `complete`, then `TAB` first tries to indent the current line, and if the line was already indented, it tries to complete the text at point (see Symbol Completion). If the value is `nil`, then `TAB` indents the current line only if point is at the left margin or in the line’s indentation; otherwise, it inserts a tab character.

Electric Indent mode is a global minor mode that automatically indents the line after every `RET` you type. This mode is enabled by default. To toggle this minor mode, type `M-x electric-indent-mode`. To toggle the mode in a single buffer, use `M-x electric-indent-local-mode`.