diff --git a/README.md b/README.md
index df86a67..c3b21a8 100644
--- a/README.md
+++ b/README.md
@@ -204,6 +204,7 @@ configurations are also dependent on them).
              multiple-cursors  ; Multiple cursors for Emacs.
              org               ; Outline-based notes management and organizer
              paredit           ; minor mode for editing parentheses
+             powerline         ; Rewrite of Powerline
              pretty-lambdada   ; the word `lambda' as the Greek letter.
              smex))            ; M-x interface with Ido-style fuzzy matching.
     (upgrade-or-install-package package))
@@ -389,8 +390,39 @@ Change the color-theme to `monokai` (downloaded using `package`).
 Use the [Inconsolata](http://www.levien.com/type/myfonts/inconsolata.html) font if it's installed on the system.
 
 ```lisp
-(when (member "Inconsolata" (font-family-list))
-  (set-face-attribute 'default nil :font "Inconsolata-13"))
+(when (member "Inconsolata-g" (font-family-list))
+  (set-face-attribute 'default nil :font "Inconsolata-g-11"))
+```
+
+[Powerline](https://github.com/milkypostman/powerline) is an extension to customize the mode line. This is modified
+version `powerline-nano-theme`. This is what it looks like:
+
+![img](./powerline.png)
+
+```lisp
+(setq-default
+ mode-line-format
+ '("%e"
+   (:eval
+    (let* ((active (powerline-selected-window-active))
+           ;; left hand side displays Read only or Modified.
+           (lhs (list (powerline-raw
+                       (cond (buffer-read-only "Read only")
+                             ((buffer-modified-p) "Modified")
+                             (t "")) nil 'l)))
+           ;; right side hand displays (line,column).
+           (rhs (list
+                 (powerline-raw
+                  (concat
+                   "(" (number-to-string (line-number-at-pos))
+                   "," (number-to-string (current-column)) ")") nil 'r)))
+           ;; center displays buffer name.
+           (center (list (powerline-raw "%b" nil))))
+      (concat (powerline-render lhs)
+              (powerline-fill-center nil (/ (powerline-width center) 2.0))
+              (powerline-render center)
+              (powerline-fill nil (powerline-width rhs))
+              (powerline-render rhs))))))
 ```
 
 ## Ido
@@ -836,6 +868,9 @@ using `C-c C-c` (instead of `M-x compile`), a habit from `latex-mode`.
 (defun c-setup ()
   (local-set-key (kbd "C-c C-c") 'compile))
 
+(require 'auto-complete-c-headers)
+(add-to-list 'ac-sources 'ac-source-c-headers)
+
 (add-hook 'c-mode-common-hook 'c-setup)
 ```
 
diff --git a/init.el b/init.el
index 8e3c387..82cd58f 100644
--- a/init.el
+++ b/init.el
@@ -90,6 +90,7 @@ PACKAGE is installed and the current version is deleted."
              multiple-cursors  ; Multiple cursors for Emacs.
              org               ; Outline-based notes management and organizer
              paredit           ; minor mode for editing parentheses
+             powerline         ; Rewrite of Powerline
              pretty-lambdada   ; the word `lambda' as the Greek letter.
              smex))            ; M-x interface with Ido-style fuzzy matching.
     (upgrade-or-install-package package))
@@ -179,8 +180,32 @@ PACKAGE is installed and the current version is deleted."
 
 (load-theme 'monokai t)
 
-(when (member "Inconsolata" (font-family-list))
-  (set-face-attribute 'default nil :font "Inconsolata-13"))
+(when (member "Inconsolata-g" (font-family-list))
+  (set-face-attribute 'default nil :font "Inconsolata-g-11"))
+
+(setq-default
+ mode-line-format
+ '("%e"
+   (:eval
+    (let* ((active (powerline-selected-window-active))
+           ;; left hand side displays Read only or Modified.
+           (lhs (list (powerline-raw
+                       (cond (buffer-read-only "Read only")
+                             ((buffer-modified-p) "Modified")
+                             (t "")) nil 'l)))
+           ;; right side hand displays (line,column).
+           (rhs (list
+                 (powerline-raw
+                  (concat
+                   "(" (number-to-string (line-number-at-pos))
+                   "," (number-to-string (current-column)) ")") nil 'r)))
+           ;; center displays buffer name.
+           (center (list (powerline-raw "%b" nil))))
+      (concat (powerline-render lhs)
+              (powerline-fill-center nil (/ (powerline-width center) 2.0))
+              (powerline-render center)
+              (powerline-fill nil (powerline-width rhs))
+              (powerline-render rhs))))))
 
 (dolist (mode
          '(ido-mode                   ; Interactivly do.
@@ -407,6 +432,9 @@ LANGUAGES (cyclic) list."
 (defun c-setup ()
   (local-set-key (kbd "C-c C-c") 'compile))
 
+(require 'auto-complete-c-headers)
+(add-to-list 'ac-sources 'ac-source-c-headers)
+
 (add-hook 'c-mode-common-hook 'c-setup)
 
 (define-abbrev-table 'java-mode-abbrev-table
diff --git a/init.org b/init.org
index 7408a4f..b15c074 100644
--- a/init.org
+++ b/init.org
@@ -139,7 +139,7 @@
      (when (and do-package-update-on-init
                 (y-or-n-p "Update all packages?"))
        (package-refresh-contents)
-     
+
        (dolist (package
                 '(ac-geiser         ; Auto-complete backend for geiser
                   ac-slime          ; An auto-complete source using slime completions
@@ -161,6 +161,7 @@
                   multiple-cursors  ; Multiple cursors for Emacs.
                   org               ; Outline-based notes management and organizer
                   paredit           ; minor mode for editing parentheses
+                  powerline         ; Rewrite of Powerline
                   pretty-lambdada   ; the word `lambda' as the Greek letter.
                   smex))            ; M-x interface with Ido-style fuzzy matching.
          (upgrade-or-install-package package))
@@ -346,8 +347,39 @@
    Use the [[http://www.levien.com/type/myfonts/inconsolata.html][Inconsolata]] font if it's installed on the system.
 
    #+BEGIN_SRC emacs-lisp :tangle yes
-     (when (member "Inconsolata" (font-family-list))
-       (set-face-attribute 'default nil :font "Inconsolata-13"))
+     (when (member "Inconsolata-g" (font-family-list))
+       (set-face-attribute 'default nil :font "Inconsolata-g-11"))
+   #+END_SRC
+
+   [[https://github.com/milkypostman/powerline][Powerline]] is an extension to customize the mode line. This is modified
+   version =powerline-nano-theme=. This is what it looks like:
+
+   [[./powerline.png]]
+
+   #+BEGIN_SRC emacs-lisp :tangle yes
+     (setq-default
+      mode-line-format
+      '("%e"
+        (:eval
+         (let* ((active (powerline-selected-window-active))
+                ;; left hand side displays Read only or Modified.
+                (lhs (list (powerline-raw
+                            (cond (buffer-read-only "Read only")
+                                  ((buffer-modified-p) "Modified")
+                                  (t "")) nil 'l)))
+                ;; right side hand displays (line,column).
+                (rhs (list
+                      (powerline-raw
+                       (concat
+                        "(" (number-to-string (line-number-at-pos))
+                        "," (number-to-string (current-column)) ")") nil 'r)))
+                ;; center displays buffer name.
+                (center (list (powerline-raw "%b" nil))))
+           (concat (powerline-render lhs)
+                   (powerline-fill-center nil (/ (powerline-width center) 2.0))
+                   (powerline-render center)
+                   (powerline-fill nil (powerline-width rhs))
+                   (powerline-render rhs))))))
    #+END_SRC
 
 ** Ido
@@ -790,7 +822,10 @@
    #+BEGIN_SRC emacs-lisp :tangle yes
      (defun c-setup ()
        (local-set-key (kbd "C-c C-c") 'compile))
-
+     
+     (require 'auto-complete-c-headers)
+     (add-to-list 'ac-sources 'ac-source-c-headers)
+     
      (add-hook 'c-mode-common-hook 'c-setup)
    #+END_SRC
 
diff --git a/init.pdf b/init.pdf
index d13a8b4..3e52486 100644
Binary files a/init.pdf and b/init.pdf differ
diff --git a/powerline.png b/powerline.png
new file mode 100644
index 0000000..161eda7
Binary files /dev/null and b/powerline.png differ