diff --git a/custom/setup-autocompletion.el b/custom/setup-autocompletion.el
new file mode 100644
index 0000000..6e0793b
--- /dev/null
+++ b/custom/setup-autocompletion.el
@@ -0,0 +1,6 @@
+(eval-after-load 'company
+  '(progn
+     (define-key company-mode-map (kbd "C-:") 'helm-company)
+     (define-key company-active-map (kbd "C-:") 'helm-company)))
+
+(provide 'setup-autocompletion)
diff --git a/init.el b/init.el
index e8f16a0..bcceebc 100644
--- a/init.el
+++ b/init.el
@@ -42,9 +42,11 @@
     comment-dwim-2
     yasnippet
     sr-speedbar
+    company
     helm
     helm-gtags
     helm-swoop
+    helm-company
     ))
 
 ;; function to install new packages
@@ -71,6 +73,9 @@
 ;; setup speedbar
 (require 'setup-speedbar)
 
+;; setup autocompletion
+(require 'setup-autocompletion)
+
 ;; Package zygospore --- revert C-x 1 by pressing C-x 1 again
 (global-set-key (kbd "C-x 1") 'zygospore-toggle-delete-other-windows)