diff --git a/chrono/api/serializers.py b/chrono/api/serializers.py
index 2974ea46..198d9eb0 100644
--- a/chrono/api/serializers.py
+++ b/chrono/api/serializers.py
@@ -3,7 +3,7 @@ from django.utils.translation import ugettext_lazy as _
 from rest_framework import serializers
 from rest_framework.exceptions import ValidationError
 
-from chrono.agendas.models import AbsenceReason, Agenda, Booking, Event
+from chrono.agendas.models import AbsenceReason, Agenda, Booking, Category, Event
 
 
 class StringOrListField(serializers.ListField):
@@ -163,6 +163,7 @@ class EventSerializer(serializers.ModelSerializer):
 class AgendaSerializer(serializers.ModelSerializer):
     edit_role = serializers.CharField(required=False, max_length=150)
     view_role = serializers.CharField(required=False, max_length=150)
+    category = serializers.SlugField(required=False, max_length=160)
 
     class Meta:
         model = Agenda
@@ -176,6 +177,7 @@ class AgendaSerializer(serializers.ModelSerializer):
             'anonymize_delay',
             'edit_role',
             'view_role',
+            'category',
         ]
 
     def get_role(self, value):
@@ -190,6 +192,12 @@ class AgendaSerializer(serializers.ModelSerializer):
     def validate_view_role(self, value):
         return self.get_role(value)
 
+    def validate_category(self, value):
+        try:
+            return Category.objects.get(slug=value)
+        except Category.DoesNotExist:
+            raise serializers.ValidationError(_('unknown category: %s' % value))
+
     def validate(self, attrs):
         super().validate(attrs)
         if attrs['minimal_booking_delay_in_working_days'] and attrs.get('kind', 'events') != 'events':
diff --git a/tests/api/test_all.py b/tests/api/test_all.py
index f25c2604..5ac8a075 100644
--- a/tests/api/test_all.py
+++ b/tests/api/test_all.py
@@ -603,6 +603,7 @@ def test_virtual_agendas_meetingtypes_api(app):
 
 @pytest.mark.freeze_time('2021-07-09')
 def test_add_agenda(app, user, settings):
+    category_a = Category.objects.create(label='Category A')
     api_url = '/api/agenda/'
 
     # no authentication
@@ -631,6 +632,7 @@ def test_add_agenda(app, user, settings):
         'anonymize_delay': 'oups',
         'edit_role': 'oups',
         'view_role': 'plop',
+        'category': 'oups',
     }
     resp = app.post(api_url, params=params, status=400)
     assert resp.json['err']
@@ -641,6 +643,7 @@ def test_add_agenda(app, user, settings):
         'anonymize_delay': ['A valid integer is required.'],
         'edit_role': ['unknown role: oups'],
         'view_role': ['unknown role: plop'],
+        'category': ['unknown category: oups'],
     }
 
     # slug already used
@@ -692,6 +695,7 @@ def test_add_agenda(app, user, settings):
         'anonymize_delay': 30,
         'edit_role': 'Edit',
         'view_role': 'View',
+        'category': 'category-a',
     }
     resp = app.post(api_url, params=params)
     assert not resp.json['err']
@@ -700,6 +704,7 @@ def test_add_agenda(app, user, settings):
     assert agenda.min_booking_datetime.date() == datetime.date(2021, 7, 10)
     assert agenda.edit_role == edit_group
     assert agenda.view_role == view_group
+    assert agenda.category == category_a
 
     # add an events agenda
     params = {
@@ -712,6 +717,7 @@ def test_add_agenda(app, user, settings):
         'anonymize_delay': 30,
         'edit_role': 'Edit',
         'view_role': 'View',
+        'category': 'category-a',
     }
     resp = app.post(api_url, params=params)
     assert not resp.json['err']
@@ -720,3 +726,4 @@ def test_add_agenda(app, user, settings):
     assert agenda.edit_role == edit_group
     assert agenda.view_role == view_group
     assert agenda.min_booking_datetime.date() == datetime.date(2021, 7, 12)
+    assert agenda.category == category_a