diff --git a/Dockerfile b/Dockerfile
index 715aab6..1741632 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -34,4 +34,4 @@ COPY --from=base /usr/local/bundle /usr/local/bundle
 EXPOSE 8080
 
 # Start the Rails server
-CMD ["rails", "server", "-b", "0.0.0.0", "-e", "production", "-p", "8080"]
+CMD ["rails", "server", "-b", "0.0.0.0", "-e", "production", "-p", "8080"]
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index d5d1627..3d973d0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -234,4 +234,4 @@ RUBY VERSION
    ruby 2.7.7p221
 
 BUNDLED WITH
-   2.4.21
+   2.4.21
\ No newline at end of file
diff --git a/app/models/option.rb b/app/models/option.rb
index a5a3b25..08606c0 100644
--- a/app/models/option.rb
+++ b/app/models/option.rb
@@ -12,7 +12,7 @@ class Option
    def self.getOptionList
       {
          reader: %w[mdJson sbJson fgdc],
-         writer: %w[iso19115_3 iso19115_2 iso19110 html mdJson sbJson fgdc simple_html],
+         writer: %w[iso19115_3 iso19115_2 iso19110 html mdJson sbJson fgdc simple_html dcat_us],
          format: %w[auto plain json xml],
          validate: %w[none normal strict],
          showAllTags: %w[true false],
diff --git a/app/views/api/v3/demos/show.html.erb b/app/views/api/v3/demos/show.html.erb
index 6e6d32d..ca51574 100644
--- a/app/views/api/v3/demos/show.html.erb
+++ b/app/views/api/v3/demos/show.html.erb
@@ -76,6 +76,7 @@
                         <option value="simple_html">Simple HTML</option>
                         <option value="html" selected="selected">html</option>
                         <option value="fgdc">fgdc</option>
+                        <option value="dcat_us">dcat_us</option>
                         <option value="iso19110">iso19110</option>
                         <option value="iso19115_3">iso19115_1 (alias of iso19115_3)</option>
                         <option value="iso19115_2">iso19115_2/19139 (deprecated)</option>