Update CONTRIBUTING.md

1 files changed, 12 insertions, 0 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 33b7195aa1..342d5a86a9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -81,7 +81,19 @@ Check your coding style:
 
 * In most code (Erlang and C), indentation is 4 steps. Indentation using only spaces is **strongly recommended**.
 
+### Configuring Emacs
+
 If you use Emacs, use the Erlang mode, and add the following lines to `.emacs`:
 
     (setq indent-tabs-mode nil)
     (setq c-basic-offset 4)
+
+If you want to change the setting only for the Erlang mode, you can use a hook like this:
+
+```
+(add-hook 'erlang-mode-hook 'my-erlang-hook)
+
+(defun my-erlang-hook ()
+  ( ;;; Untabify.
+  (setq indent-tabs-mode nil))
+```