Merge pull request #22857 from bdewater/interlock-doc

Update middleware docs regarding ActionDispatch::LoadInterlock [ci skip]

1 files changed, 7 insertions, 3 deletions

diff --git a/guides/source/rails_on_rack.md b/guides/source/rails_on_rack.md
index 934693252e..3b61d65df5 100644
--- a/guides/source/rails_on_rack.md
+++ b/guides/source/rails_on_rack.md
@@ -104,7 +104,7 @@ For a freshly generated Rails application, this might produce something like:
 ```ruby
 use Rack::Sendfile
 use ActionDispatch::Static
-use Rack::Lock
+use ActionDispatch::LoadInterlock
 use #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x000000029a0838>
 use Rack::Runtime
 use Rack::MethodOverride
@@ -171,10 +171,10 @@ Add the following lines to your application configuration:
 
 ```ruby
 # config/application.rb
-config.middleware.delete Rack::Lock
+config.middleware.delete Rack::Runtime
 ```
 
-And now if you inspect the middleware stack, you'll find that `Rack::Lock` is
+And now if you inspect the middleware stack, you'll find that `Rack::Runtime` is
 not a part of it.
 
 ```bash
@@ -219,6 +219,10 @@ Much of Action Controller's functionality is implemented as Middlewares. The fol
 
 * Sets `env["rack.multithread"]` flag to `false` and wraps the application within a Mutex.
 
+**`ActionDispatch::LoadInterlock`**
+
+* Used for thread safe code reloading during development.
+
 **`ActiveSupport::Cache::Strategy::LocalCache::Middleware`**
 
 * Used for memory caching. This cache is not thread safe.