diff --git a/spec/acceptance/running_strings_generate.rb b/spec/acceptance/running_strings_generate.rb
index a8c382e..48c2104 100644
--- a/spec/acceptance/running_strings_generate.rb
+++ b/spec/acceptance/running_strings_generate.rb
@@ -18,6 +18,19 @@ describe 'Generating module documentation using generate action' do
     expect(read_file_on(master, '/root/doc/puppet_classes/test.html')).to include('Class: test')
   end
 
+  it 'should generate documentation for puppet functions' do
+    puppet_version = on(master, facter('puppetversion')).stdout.chomp.to_i
+
+    if puppet_version >= 4
+      html_output = read_file_on(master, '/root/doc/puppet_functions_puppet/test_3A_3Aadd.html')
+      expect(html_output).to include('Adds two integers together.')
+      expect(html_output).to include('<pre class="example code"><code>test::add(1, 2) =&gt; 3</code></pre>')
+      expect(html_output).to include('<p>The first integer to add.</p>')
+      expect(html_output).to include('<p>The second integer to add.</p>')
+      expect(html_output).to include('<p>Returns the sum of x and y.</p>')
+    end
+  end
+
   it 'should generate documentation for 3x functions' do
     expect(read_file_on(master, '/root/doc/puppet_functions_ruby3x/function3x.html')).to include('This is the function documentation for <code>function3x</code>')
   end
diff --git a/spec/fixtures/acceptance/modules/test/functions/add.pp b/spec/fixtures/acceptance/modules/test/functions/add.pp
new file mode 100644
index 0000000..21f0d40
--- /dev/null
+++ b/spec/fixtures/acceptance/modules/test/functions/add.pp
@@ -0,0 +1,9 @@
+# Adds two integers together.
+# @param x The first integer to add.
+# @param y The second integer to add.
+# @return [Integer] Returns the sum of x and y.
+# @example Example of adding two integers.
+#   test::add(1, 2) => 3
+function test::add(Integer $x, Integer $y) {
+  $x + $y
+}