diff --git a/app/controllers/supporters_controller.rb b/app/controllers/supporters_controller.rb
index bbce1c0..cd1c36c 100644
--- a/app/controllers/supporters_controller.rb
+++ b/app/controllers/supporters_controller.rb
@@ -18,6 +18,6 @@ class SupportersController < ApplicationController
   private
 
   def supporter_form_params
-    params.require(:supporter).permit(:first_name, :last_name, :street, :zip, :email, :support, :age_category, :city, :comments)
+    params.require(:supporter).permit(:first_name, :last_name, :street, :zip, :email, :support, :li_membership, :age_category, :city, :comments)
   end
 end
diff --git a/app/models/supporter.rb b/app/models/supporter.rb
index f8d87e3..c68aa23 100644
--- a/app/models/supporter.rb
+++ b/app/models/supporter.rb
@@ -15,6 +15,7 @@ class Supporter
   field :city,         type: String
   field :email,        type: String
   field :support,      type: String # Indicates the type of support
+  field :li_membership, type: Boolean
   field :age_category, type: String
   field :coordinates,  type: Array
   field :comments,     type: String
diff --git a/app/views/supporters/_form.slim b/app/views/supporters/_form.slim
index 0413b47..2321ca6 100644
--- a/app/views/supporters/_form.slim
+++ b/app/views/supporters/_form.slim
@@ -10,6 +10,7 @@ h1 = title t('.title_html')
       = f.input :zip, placeholder: t('.placeholders.zip')
       = f.input :email, placeholder: t('.placeholders.email')
       = f.input :support, as: :radio_buttons, collection: t('support_type').map{ |x| [x.first, raw(x.last)]}, label_method: :last, value_method: :first
+      = f.input :li_membership, as: :boolean
       = f.input :age_category, as: :radio_buttons, collection: t('age_category'), label_method: :last, value_method: :first
       = f.input :comments, as: :text
       .form-group
diff --git a/config/locales/de.yml b/config/locales/de.yml
index a000d6d..a831324 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -42,4 +42,5 @@ de:
         email: E-Mail
         support: Unterstützung
         age_category: Alterskategorie
+        li_membership: Ich bin interessiert an einer Mitgliedschaft beim Verein Legalize it! (50 Franken pro Jahr)
         comments: Kommentar / Feedback (optional)
diff --git a/spec/features/support_spec.rb b/spec/features/support_spec.rb
index d0f162a..a7a79df 100644
--- a/spec/features/support_spec.rb
+++ b/spec/features/support_spec.rb
@@ -17,11 +17,14 @@ feature 'Support announcement' do
 
     choose 'Ich bin über 64 Jahre alt'
 
+    check 'Ich bin interessiert an einer Mitgliedschaft beim Verein Legalize it! (50 Franken pro Jahr)'
+
     expect { click_button 'Unterstützung zusichern' }.to change { Supporter.count }.by(1)
     supporter = Supporter.find_by(email: 'blocher@blocher.ch')
     expect(supporter.coordinates).to eq [8.618589100000001, 47.2926304]
     expect(supporter.comments).to eq 'Test text'
     expect(supporter.language).to eq 'de'
+    expect(supporter.li_membership).to eq true
   end
 
   scenario 'A bot tries to enter data' do