diff --git a/apiserver/apiserver/api/models.py b/apiserver/apiserver/api/models.py
index b77a7e4..4a66f40 100644
--- a/apiserver/apiserver/api/models.py
+++ b/apiserver/apiserver/api/models.py
@@ -18,6 +18,7 @@ def today_alberta_tz():
 
 class Member(models.Model):
     user = models.OneToOneField(User, related_name='member', blank=True, null=True, on_delete=models.SET_NULL)
+    signup_helper = models.ForeignKey(User, related_name='signed_up', blank=True, null=True, on_delete=models.SET_NULL)
     old_email = models.CharField(max_length=254, blank=True, null=True)
     photo_large = models.CharField(max_length=64, blank=True, null=True)
     photo_medium = models.CharField(max_length=64, blank=True, null=True)
diff --git a/apiserver/apiserver/api/serializers.py b/apiserver/apiserver/api/serializers.py
index f9e480d..b37b768 100644
--- a/apiserver/apiserver/api/serializers.py
+++ b/apiserver/apiserver/api/serializers.py
@@ -285,6 +285,7 @@ class MemberSerializer(serializers.ModelSerializer):
             'trotec_cert_date',
             'is_allowed_entry',
             'mediawiki_username',
+            'signup_helper',
         ]
 
     def get_protocoin(self, obj):
@@ -309,6 +310,11 @@ class MemberSerializer(serializers.ModelSerializer):
             instance.photo_medium = medium
             instance.photo_large = large
 
+        helper_id = self.initial_data.get('helper_id', None)
+        if helper_id:
+            signup_helper = get_object_or_404(models.Member, id=helper_id)
+            instance.signup_helper = signup_helper.user
+
         if 'discourse_username' in validated_data:
             changed = validated_data['discourse_username'] != instance.discourse_username
             if changed and utils_auth.discourse_is_configured():
@@ -533,12 +539,13 @@ class StorageSpaceSerializer(serializers.ModelSerializer):
             'id',
             'shelf_id',
             'location',
+            'user',
         ]
 
     def update(self, instance, validated_data):
         member_id = self.initial_data.get('member_id', None)
         if member_id:
-            member = get_object_or_404(models.Member, id=self.initial_data['member_id'])
+            member = get_object_or_404(models.Member, id=member_id)
             validated_data['user'] = member.user
         else:
             validated_data['user'] = None
diff --git a/webclient/src/Account.js b/webclient/src/Account.js
index bd0246e..18c11fa 100644
--- a/webclient/src/Account.js
+++ b/webclient/src/Account.js
@@ -4,6 +4,7 @@ import * as loadImage from 'blueimp-load-image';
 import ReactCrop from 'react-image-crop';
 import 'react-image-crop/dist/ReactCrop.css';
 import './light.css';
+import { MembersDropdown } from './Members.js';
 import { Button, Container, Form, Grid, Header, Message, Segment } from 'semantic-ui-react';
 import { requester, randomString } from './utils.js';
 
@@ -300,6 +301,17 @@ export function AccountForm(props) {
 				</>
 			}
 
+			{isSignup && <Form.Field error={error.member_id}>
+				<label>Who helped you sign up? (search)</label>
+				<MembersDropdown
+					token={token}
+					{...makeProps('helper_id')}
+					onChange={handleValues}
+					initial={''}
+					autofocus={''}
+				/>
+			</Form.Field>}
+
 			<Form.Button loading={loading} error={error.non_field_errors}>
 				Submit
 			</Form.Button>