diff --git a/CHANGELOG.md b/CHANGELOG.md
index 607e1d0470..4acddbcd9f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@
     * If you have created a custom responder and/or failure app just to customize responses for better Hotwire/Turbo integration, they should no longer be necessary.
     * `:turbo_stream` is now treated as a navigational format, so it works like HTML navigation when using Turbo. Note: if you relied on `:turbo_stream` to be treated as a non-navigational format before, you can reconfigure your `navigational_formats` in the Devise initializer file to exclude it.
     * OmniAuth "Sign in with" links were changed to buttons that generate HTML forms with method=POST, instead of using link + method=POST that required rails/ujs to work. Since rails/ujs is no longer the default for new Rails apps, this allows the OmniAuth buttons to work in any scenario, with or without rails/ujs and/or Turbo. This only affects apps that are using the default `devise/shared/_links.html.erb` partial from Devise with OmniAuth enabled.
+    * Check [this upgrade guide](https://github.com/heartcombo/devise/wiki/How-To:-Upgrade-to-Devise-4.9.0-[Hotwire-Turbo-integration]) for more detailed information.
 
 ### 4.8.1 - 2021-12-16
 
diff --git a/README.md b/README.md
index b5076cb909..35f80995fa 100644
--- a/README.md
+++ b/README.md
@@ -493,7 +493,7 @@ Devise.setup do |config|
 end
 ```
 
-**Important**: these custom responses require the `responders` gem version to be `3.1.0` or higher, please make sure you update it if you're going to use this configuration.
+**Important**: these custom responses require the `responders` gem version to be `3.1.0` or higher, please make sure you update it if you're going to use this configuration. Check [this upgrade guide](https://github.com/heartcombo/devise/wiki/How-To:-Upgrade-to-Devise-4.9.0-[Hotwire-Turbo-integration]) for more info.
 
 _Note_: the above statuses configuration may become the default for Devise in a future release.
 
diff --git a/devise.gemspec b/devise.gemspec
index 78c0177aab..3efad0f4d6 100644
--- a/devise.gemspec
+++ b/devise.gemspec
@@ -32,4 +32,11 @@ Gem::Specification.new do |s|
   s.add_dependency("bcrypt", "~> 3.0")
   s.add_dependency("railties", ">= 4.1.0")
   s.add_dependency("responders")
+
+  s.post_install_message = %q{
+[DEVISE] Please review the [changelog] and [upgrade guide] for more info on Hotwire / Turbo integration.
+
+  [changelog] https://github.com/heartcombo/devise/blob/main/CHANGELOG.md
+  [upgrade guide] https://github.com/heartcombo/devise/wiki/How-To:-Upgrade-to-Devise-4.9.0-%5BHotwire-Turbo-integration%5D
+  }
 end