diff --git a/configuration.org b/configuration.org
index ee546b9..7c3a30f 100644
--- a/configuration.org
+++ b/configuration.org
@@ -2607,6 +2607,12 @@ Automatically add spaces around operators.
   (prog-mode . rainbow-delimiters-mode))
 #+END_SRC
 
+** Colourful identifiers
+
+#+begin_src emacs-lisp
+(use-package rainbow-identifiers)
+#+end_src
+
 ** REST Client
 
 #+BEGIN_SRC emacs-lisp