diff --git a/.gitignore b/.gitignore
index 9e539080cd..d2900227c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,6 +22,7 @@ previews/docs/
 test/snapshots/
 test/snapshots/docs/
 demo/test/snapshots/
+previews/pages/*.md.erb
 previews/pages/forms/inputs/*.md.erb
 docs/content/adr/
 docs/content/components/
diff --git a/Gemfile b/Gemfile
index 9c582fcf27..e9f7587a1e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -43,4 +43,9 @@ gem "view_component", path: ENV["VIEW_COMPONENT_PATH"] if ENV["VIEW_COMPONENT_PA
 
 group :test do
   gem "webmock"
+
+  # Disallow v5.19 for now since it breaks mocha.
+  # See: https://github.com/freerange/mocha/issues/614
+  # Remove this line when mocha has fixed the issue
+  gem "minitest", "< 5.19"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index b810a1d77c..f8e9b09f30 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,8 +110,8 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.2)
     mini_portile2 (2.8.1)
-    minitest (5.17.0)
-    mocha (2.0.2)
+    minitest (5.18.1)
+    mocha (2.0.4)
       ruby2_keywords (>= 0.0.5)
     msgpack (1.7.0)
     nio4r (2.5.9)
@@ -251,7 +251,7 @@ DEPENDENCIES
   listen (~> 3.0)
   lookbook (~> 2.0.0)
   matrix (~> 0.4.2)
-  minitest (~> 5.0)
+  minitest (< 5.19)
   mocha
   primer_view_components!
   pry
diff --git a/lib/primer/yard/lookbook_pages_backend.rb b/lib/primer/yard/lookbook_pages_backend.rb
index 0ceb2404f9..cbc494c4f1 100644
--- a/lib/primer/yard/lookbook_pages_backend.rb
+++ b/lib/primer/yard/lookbook_pages_backend.rb
@@ -176,6 +176,7 @@ def generate
         each_component do |component_ref|
           page_for(component_ref).generate
         end
+        generate_system_args_docs
       end
 
       def page_for(component_ref)
@@ -194,6 +195,36 @@ def view_context
       def each_component(&block)
         manifest.each(&block)
       end
+
+      def generate_system_args_docs
+        docs = registry.find(Primer::BaseComponent)
+
+        path = File.expand_path(
+          File.join(
+            *%w[.. .. .. previews pages system-arguments.md.erb]
+          ), __dir__
+        )
+
+        data = {
+          "description_md" => docs.base_docstring.to_s,
+          "args_md" => view_context.render(inline: docs.constructor.base_docstring)
+        }
+
+        frontmatter = {
+          "title" => "System arguments",
+          "id" => "system_arguments",
+          "data" => data
+        }
+
+        File.write(
+          path, <<~ERB
+            #{YAML.dump(frontmatter)}
+            ---
+            <%= @page.data[:description_md] %>
+            <%= @page.data[:args_md] %>
+          ERB
+        )
+      end
     end
   end
 end