diff --git a/emacs/.emacs.d/init.org b/emacs/.emacs.d/init.org
index 92fd80c..8a313e2 100644
--- a/emacs/.emacs.d/init.org
+++ b/emacs/.emacs.d/init.org
@@ -862,6 +862,12 @@ Computing Environment".
      (setq projectile-completion-system 'ivy)
    #+END_SRC
 
+   Add ~yarn.lock~ as a possible root file for Projectile.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-to-list 'projectile-project-root-files "yarn.lock")
+   #+END_SRC
+
 ** Server mode
 
    Diminish server mode with a nice icon.