diff --git a/README.ja.md b/README.ja.md
index 732e531b..1b002436 100644
--- a/README.ja.md
+++ b/README.ja.md
@@ -7,7 +7,9 @@
[](https://github.com/emacs-php/php-mode/actions)
[![melpa badge][melpa-badge]][melpa-link]
[![melpa stable badge][melpa-stable-badge]][melpa-stable-link]
-[](http://www.gnu.org/licenses/gpl-3.0.txt)
+[](http://www.gnu.org/licenses/gpl-3.0.txt)
+[![NonGNU ELPA][nongnu-elpa-badge]][nongnu-elpa]
+[![NonGNU-devel ELPA][nongnu-devel-elpa-badge]][nongnu-devel-elpa]
A powerful and flexible Emacs major mode for editing PHP scripts
@@ -20,6 +22,22 @@ A powerful and flexible Emacs major mode for editing PHP scripts
**PHP ModeはEmacs 25.2以降で動作します**。古いバージョンのEmacsでも動作するかもしれませんが、保証外です。 古いバージョンのEmacsのPHPモードを使用することによる問題のバグ報告は積極的に対応しません。現在のサポートポリシーは[Supported Version]のページをご覧ください。
+### NonGNU ELPAからのインストール
+
+[![NonGNU ELPA][nongnu-elpa-badge]][nongnu-elpa] [![NonGNU-devel ELPA][nongnu-devel-elpa-badge]][nongnu-devel-elpa]
+
+Emacs 28 (未リリース; 次期バージョン) では[NonGNU ELPA](https://elpa.nongnu.org/)がデフォルトのパッケージリポジトリとして追加されています。
+
+```el
+;; For Emacs < 28
+(when (< emacs-major-version 28)
+ (with-eval-after-load 'package
+ (add-to-list 'package-archives '("nongnu" . "https://elpa.nongnu.org/nongnu/"))))
+
+(unless (package-installed-p 'php-mode)
+ (package-install 'php-mode))
+```
+
### **(推奨)** MELPAからのインストール
[![melpa badge][melpa-badge]][melpa-link] [![melpa stable badge][melpa-stable-badge]][melpa-stable-link]
@@ -339,6 +357,10 @@ PHP Modeは[GNU General Public License Version 3][gpl-v3] (GPLv3) でライセ
[elpa-php-mode]: https://packages.debian.org/sid/elpa-php-mode
[gpl-v3]: https://www.gnu.org/licenses/quick-guide-gplv3.html
[issue-430]: https://github.com/emacs-php/php-mode/issues/430
+[nongnu-devel-elpa-badge]: https://elpa.nongnu.org/nongnu-devel/php-mode.svg
+[nongnu-devel-elpa]: https://elpa.nongnu.org/nongnu-devel/php-mode.html
+[nongnu-elpa-badge]: https://elpa.nongnu.org/nongnu/php-mode.svg
+[nongnu-elpa]: https://elpa.nongnu.org/nongnu/php-mode.html
[melpa-badge]: http://melpa.org/packages/php-mode-badge.svg
[melpa-link]: http://melpa.org/#/php-mode
[melpa-stable-badge]: http://stable.melpa.org/packages/php-mode-badge.svg
diff --git a/README.md b/README.md
index 6f227dad..d273c16c 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,9 @@
[](https://github.com/emacs-php/php-mode/actions)
[![melpa badge][melpa-badge]][melpa-link]
[![melpa stable badge][melpa-stable-badge]][melpa-stable-link]
-[](http://www.gnu.org/licenses/gpl-3.0.txt)
+[](http://www.gnu.org/licenses/gpl-3.0.txt)
+[![NonGNU ELPA][nongnu-elpa-badge]][nongnu-elpa]
+[![NonGNU-devel ELPA][nongnu-devel-elpa-badge]][nongnu-devel-elpa]
A powerful and flexible Emacs major mode for editing PHP scripts
@@ -22,6 +24,22 @@ Installation
The current support policy can be found on the [Supported Version] page.
+### Install from NonGNU ELPA
+
+[![NonGNU ELPA][nongnu-elpa-badge]][nongnu-elpa] [![NonGNU-devel ELPA][nongnu-devel-elpa-badge]][nongnu-devel-elpa]
+
+Emacs 28 (unreleased; next major version) includes [NonGNU ELPA](https://elpa.nongnu.org/) as the default package repository.
+
+```el
+;; For Emacs < 28
+(when (< emacs-major-version 28)
+ (with-eval-after-load 'package
+ (add-to-list 'package-archives '("nongnu" . "https://elpa.nongnu.org/nongnu/"))))
+
+(unless (package-installed-p 'php-mode)
+ (package-install 'php-mode))
+```
+
### **(RECOMMENDED)** Install from MELPA
[![melpa badge][melpa-badge]][melpa-link] [![melpa stable badge][melpa-stable-badge]][melpa-stable-link]
@@ -319,6 +337,10 @@ This project was maintained by [Eric James Michael Ritz][@ejmr] until 2017. Curr
[elpa-php-mode]: https://packages.debian.org/sid/elpa-php-mode
[gpl-v3]: https://www.gnu.org/licenses/quick-guide-gplv3.html
[issue-430]: https://github.com/emacs-php/php-mode/issues/430
+[nongnu-devel-elpa-badge]: https://elpa.nongnu.org/nongnu-devel/php-mode.svg
+[nongnu-devel-elpa]: https://elpa.nongnu.org/nongnu-devel/php-mode.html
+[nongnu-elpa-badge]: https://elpa.nongnu.org/nongnu/php-mode.svg
+[nongnu-elpa]: https://elpa.nongnu.org/nongnu/php-mode.html
[melpa-badge]: http://melpa.org/packages/php-mode-badge.svg
[melpa-link]: http://melpa.org/#/php-mode
[melpa-stable-badge]: http://stable.melpa.org/packages/php-mode-badge.svg