diff --git a/sideline-racket.el b/sideline-racket.el
index 9cf4a3f..520af2b 100644
--- a/sideline-racket.el
+++ b/sideline-racket.el
@@ -28,6 +28,14 @@
 ;;
 ;; Show racket result with sideline.
 ;;
+;; 1) Add sideline-racket to sideline backends list,
+;;
+;;   (setq sideline-backends-right '(sideline-racket))
+;;
+;; 2) Then enable sideline-mode in the target buffer,
+;;
+;;   M-x sideline-mode
+;;
 
 ;;; Code: