diff --git a/.emacs.d/config/base.el b/.emacs.d/config/base.el
index 874e284..ab9148d 100644
--- a/.emacs.d/config/base.el
+++ b/.emacs.d/config/base.el
@@ -20,7 +20,7 @@
 ;; syntax coloring
 (global-font-lock-mode t)
 
-;; show end of fill-column length
+;; syntax coloring
 (global-display-fill-column-indicator-mode t)
 
 ;; paren matching
diff --git a/.emacs.d/config/c.el b/.emacs.d/config/c.el
index f013035..5f0efc4 100644
--- a/.emacs.d/config/c.el
+++ b/.emacs.d/config/c.el
@@ -1,3 +1,8 @@
 ;; set c style to linux and indention to 2
 (setq c-default-style "linux"
       c-basic-offset 2)
+
+;; set max line length to 100
+(add-hook 'c-mode-hook
+          (lambda ()
+            (set-fill-column 100)))