README.md in goodcheck-2.2.0 vs README.md in goodcheck-2.3.0

@@ -162,11 +162,11 @@
       color: true
 ```
 
 The variable binding consists of *variable name* and *variable type*, where `color` and `string` in the example above respectively. You have to add a key of the *variable name* in `where` attribute.
 
-We have 8 builtin patterns:
+We have 8 built-in patterns:
 
 * `string`
 * `int`
 * `float`
 * `number`
@@ -268,11 +268,11 @@
             <meta charset="utf-8"></meta>
           </html>
 ```
 
 You can continue existing `pattern` definitions, but `goodcheck test` against `pattern`s with `glob` does not work.
-If your `pattern` definition includes `glob`, swithing `trigger` would make sense.
+If your `pattern` definition includes `glob`, switching `trigger` would make sense.
 
 ## Importing rules
 
 `goodcheck.yml` can have optional `import` attribute.
 
@@ -366,18 +366,21 @@
 
 The cache expires in 3 minutes.
 
 ## Docker Images
 
-You can use [Docker images](https://hub.docker.com/r/sider/goodcheck/) to use Goodcheck.
-For example:
+We provide Docker images of Goodcheck so that you can try Goodcheck without installing them.
+Pick a version of Goodcheck from images page.
 
-```bash
-$ docker pull sider/goodcheck
+- https://hub.docker.com/r/sider/goodcheck/
 
-$ cd /path/to/your/project
-$ docker run -it --rm -v "$(pwd):/work" sider/goodcheck goodcheck check
+```bash
+$ docker pull sider/goodcheck:2.3.0
+$ docker run -t --rm -v "$(pwd):/work" sider/goodcheck:2.3.0 check
 ```
+
+We don't recommend using `latest` tag.
+It updates every time we push a commit to `master` branch, and may include a version which is not ready for publish.
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.