diff --git a/init.el b/init.el
index a4a9842..3c325e8 100644
--- a/init.el
+++ b/init.el
@@ -33,6 +33,10 @@
 ;; * Packages
 
 (when (< emacs-major-version 27)
+  ;; Before Emacs 27.1, we have to do package initialization ourselves.  In
+  ;; Emacs 27.1 and later, it's done in early-init.el, and calling
+  ;; `package-initialize' is not necessary anymore.  See
+  ;; https://www.gnu.org/software/emacs/news/NEWS.27.1
   (load-file (expand-file-name "early-init.el" emacs-d))
   (package-initialize))