diff --git a/cvat/apps/engine/serializers.py b/cvat/apps/engine/serializers.py
index 4aab32f4..f4c7b66a 100644
--- a/cvat/apps/engine/serializers.py
+++ b/cvat/apps/engine/serializers.py
@@ -70,7 +70,7 @@ class LabelSerializer(serializers.ModelSerializer):
     attributes = AttributeSerializer(many=True, source='attributespec_set',
         default=[])
     color = serializers.CharField(allow_blank=True, required=False)
-    deleted = serializers.BooleanField(required=False)
+    deleted = serializers.BooleanField(required=False, help_text="Delete label if value is true from proper Task/Project object")
 
     class Meta:
         model = models.Label
diff --git a/cvat/apps/engine/views.py b/cvat/apps/engine/views.py
index 5ab76673..d15136b6 100644
--- a/cvat/apps/engine/views.py
+++ b/cvat/apps/engine/views.py
@@ -215,7 +215,11 @@ class ProjectFilter(filters.FilterSet):
         openapi.Parameter('owner', openapi.IN_QUERY, description="Find all project where owner name contains a parameter value",
             type=openapi.TYPE_STRING),
         openapi.Parameter('status', openapi.IN_QUERY, description="Find all projects with a specific status",
-            type=openapi.TYPE_STRING, enum=[str(i) for i in StatusChoice])]))
+            type=openapi.TYPE_STRING, enum=[str(i) for i in StatusChoice]),
+        openapi.Parameter('names_only', openapi.IN_QUERY, description="Returns only names and id's of projects.",
+            type=openapi.TYPE_BOOLEAN),
+        openapi.Parameter('without_tasks', openapi.IN_QUERY, description="Returns only projects entities without related tasks",
+            type=openapi.TYPE_BOOLEAN)],))
 @method_decorator(name='create', decorator=swagger_auto_schema(operation_summary='Method creates a new project'))
 @method_decorator(name='retrieve', decorator=swagger_auto_schema(operation_summary='Method returns details of a specific project'))
 @method_decorator(name='destroy', decorator=swagger_auto_schema(operation_summary='Method deletes a specific project'))