diff --git a/spec/license_fields_spec.rb b/spec/license_fields_spec.rb
new file mode 100644
index 0000000..af0a177
--- /dev/null
+++ b/spec/license_fields_spec.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'license fillable fields' do
+  licenses.each do |license|
+    context "The #{license['title']} license" do
+      it 'should only contain supported fillable fields' do
+        matches = license['content'][0, 1000].scan(/\[([a-z]+)\]/)
+        extra_fields = matches.flatten - (fields.map { |f| f['name'] })
+        expect(extra_fields).to be_empty
+      end
+    end
+  end
+end