diff --git a/client/src/pages/userProfile/UserProfilePage.vue b/client/src/pages/userProfile/UserProfilePage.vue
index 7bd87afe..d21cfd0f 100644
--- a/client/src/pages/userProfile/UserProfilePage.vue
+++ b/client/src/pages/userProfile/UserProfilePage.vue
@@ -53,7 +53,12 @@ onMounted(() => {
           <div class="flex flex-col">
             <h2 class="mb-2">{{ user.first_name }} {{ user.last_name }}</h2>
             <p class="mb-2">{{ user.email }}</p>
-            <p class="text-gray-800">{{ $t("a.Teilnehmer") }}</p>
+            <p class="text-gray-800">
+              {{ $t("a.Teilnehmer") }}
+              <span v-if="user.optional_attendance">
+                ({{ $t("a.Optionale Anwesenheit") }})
+              </span>
+            </p>
           </div>
         </div>
       </div>
diff --git a/server/vbv_lernwelt/core/serializers.py b/server/vbv_lernwelt/core/serializers.py
index 31965017..d099c6ee 100644
--- a/server/vbv_lernwelt/core/serializers.py
+++ b/server/vbv_lernwelt/core/serializers.py
@@ -55,6 +55,7 @@ class UserSerializer(serializers.ModelSerializer):
     course_session_experts = serializers.SerializerMethodField()
     country = CountrySerializer()
     organisation_country = CountrySerializer()
+    optional_attendance = serializers.SerializerMethodField()
 
     class Meta:
         model = User
@@ -83,6 +84,7 @@ class UserSerializer(serializers.ModelSerializer):
             "organisation_postal_code",
             "organisation_city",
             "organisation_country",
+            "optional_attendance",
         ]
         read_only_fields = [
             "id",
@@ -108,6 +110,11 @@ class UserSerializer(serializers.ModelSerializer):
 
         return [str(_id) for _id in (supervisor_in_session_ids | expert_in_session_ids)]
 
+    def get_optional_attendance(self, obj: User) -> bool:
+        return CourseSessionUser.objects.filter(
+            user=obj, optional_attendance=True
+        ).values_list("course_session__id", flat=True)
+
     def update(self, instance, validated_data):
         country_data = validated_data.pop("country", None)
         organisation_country_data = validated_data.pop("organisation_country", None)