diff --git a/staff_features/subjects/step_definitions/subject_edit.rb b/staff_features/subjects/step_definitions/subject_edit.rb
index 0d83f25a..b7a7c4a6 100644
--- a/staff_features/subjects/step_definitions/subject_edit.rb
+++ b/staff_features/subjects/step_definitions/subject_edit.rb
@@ -52,3 +52,16 @@
 
   expect(elements.length).to eq 0
 end
+
+Then 'a new External Document is added to the Subject with the following values' do |form_values_table|
+  records = all('#subject_external_documents_ .subrecord-form-list li')
+
+  expect(records.length).to eq @subject_number_of_external_documents + 1
+
+  created_record = records.last
+
+  form_values_hash = form_values_table.rows_hash
+  form_values_hash.each do |field, value|
+    expect(created_record.find_field(field).value.downcase.gsub(' ', '_')).to eq value.downcase.gsub(' ', '_')
+  end
+end
diff --git a/staff_features/subjects/step_definitions/subject_view.rb b/staff_features/subjects/step_definitions/subject_view.rb
index f7c43dd4..9ae967c4 100644
--- a/staff_features/subjects/step_definitions/subject_view.rb
+++ b/staff_features/subjects/step_definitions/subject_view.rb
@@ -7,6 +7,8 @@
   select 'Art & Architecture Thesaurus', from: 'subject_source_'
   select 'Cultural context', from: 'subject_terms__0__term_type_'
 
+  @subject_number_of_external_documents = 0
+
   click_on 'Save'
   expect(find('.alert.alert-success.with-hide-alert').text).to eq 'Subject Created'
 
diff --git a/staff_features/subjects/subject_add_external_document.feature b/staff_features/subjects/subject_add_external_document.feature
new file mode 100644
index 00000000..52c8fb18
--- /dev/null
+++ b/staff_features/subjects/subject_add_external_document.feature
@@ -0,0 +1,22 @@
+Feature: Subject External Documemt
+  Background:
+    Given an administrator user is logged in
+      And a Subject has been created
+      And the Subject is opened in edit mode
+  Scenario: Add External Document
+     When the user clicks on 'External Documents'
+      And the user clicks on 'Add External Document'
+      And the user fills in 'Title' with 'Test title'
+      And the user fills in 'Location' with 'Test location'
+      And the user clicks on 'Save Subject'
+     Then the 'Subject' saved message is displayed
+      And a new External Document is added to the Subject with the following values
+       | Title    | Test title    |
+       | Location | Test location |
+  Scenario: External Document is not added because required fields are missing
+     When the user clicks on 'External Documents'
+      And the user clicks on 'Add External Document'
+      And the user clicks on 'Save Subject'
+     Then the following error messages are displayed
+        | Title - Property is required but was missing    |
+        | Location - Property is required but was missing |