diff --git a/custom.el b/custom.el
index 24ac41c..15cd65a 100644
--- a/custom.el
+++ b/custom.el
@@ -59,7 +59,8 @@
  '(menu-bar-mode nil)
  '(package-selected-packages
    (quote
-    (autodisass-java-bytecode
+    (format-all
+     autodisass-java-bytecode
      meghanada
      elmacro
      ace-window
diff --git a/settings.org b/settings.org
index e615b54..5955800 100644
--- a/settings.org
+++ b/settings.org
@@ -189,6 +189,14 @@ This handy function is a customized ripoff of custom-save-all
 		       (rlbr/add-config-to-tramp "/ssh:termux.*:" android-config)))
 #+END_SRC
 * Major modes
+** C
+#+BEGIN_SRC emacs-lisp
+  (use-package cc-mode
+    :mode ("\\.c\\'" . c-mode)
+    :hook (c-mode . format-all-mode)
+    :config
+    (use-package format-all))
+#+END_SRC
 ** Java
 *** Meghanada
 #+BEGIN_SRC emacs-lisp