diff --git a/early-init.el b/early-init.el
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+;;; early-init.el --- Spacemacs Early Init File
+;;
+;; Copyright (c) 2018 Sylvain Benner & Contributors
+;;
+;; Author: Miciah Dashiel Butler Masters <miciah.masters@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+;; Before Emacs 27, the init file was responsible for initializing the package
+;; manager by calling `package-initialize'. Emacs 27 changed the default
+;; behavior: It now calls `package-initialize' before loading the init file.
+;; This behavior would prevent Spacemacs's own package initialization from
+;; running. However, Emacs 27 also loads the "early init" file (this file)
+;; before it initializes the package manager, and Spacemacs can use this early
+;; init file to prevent Emacs from initializing the package manager. (See
+;; <http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=24acb31c04b4048b85311d794e600ecd7ce60d3b>.)
+;;
+;; Earlier Emacs versions do not load the early init file and do not initialize
+;; the package manager before loading the init file, so this file is neither
+;; needed nor loaded on those versions.
+(setq package-enable-at-startup nil)