diff --git a/httpd/httpd_test.go b/httpd/httpd_test.go
index e706831b..c6e2cbc6 100644
--- a/httpd/httpd_test.go
+++ b/httpd/httpd_test.go
@@ -4017,7 +4017,6 @@ func TestUpdateFolderQuotaUsageMock(t *testing.T) {
 	setBearerForReq(req, token)
 	rr = executeRequest(req)
 	checkResponseCode(t, http.StatusOK, rr)
-
 	var folderGet vfs.BaseVirtualFolder
 	req, _ = http.NewRequest(http.MethodGet, path.Join(folderPath, folderName), nil)
 	setBearerForReq(req, token)
@@ -4027,6 +4026,41 @@ func TestUpdateFolderQuotaUsageMock(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, usedQuotaFiles, folderGet.UsedQuotaFiles)
 	assert.Equal(t, usedQuotaSize, folderGet.UsedQuotaSize)
+	// now update only quota size
+	f.UsedQuotaFiles = 0
+	folderAsJSON, err = json.Marshal(f)
+	assert.NoError(t, err)
+	req, _ = http.NewRequest(http.MethodPut, updateFolderUsedQuotaPath+"?mode=add", bytes.NewBuffer(folderAsJSON))
+	setBearerForReq(req, token)
+	rr = executeRequest(req)
+	checkResponseCode(t, http.StatusOK, rr)
+	folderGet = vfs.BaseVirtualFolder{}
+	req, _ = http.NewRequest(http.MethodGet, path.Join(folderPath, folderName), nil)
+	setBearerForReq(req, token)
+	rr = executeRequest(req)
+	checkResponseCode(t, http.StatusOK, rr)
+	err = render.DecodeJSON(rr.Body, &folderGet)
+	assert.NoError(t, err)
+	assert.Equal(t, usedQuotaFiles, folderGet.UsedQuotaFiles)
+	assert.Equal(t, usedQuotaSize*2, folderGet.UsedQuotaSize)
+	// now update only quota files
+	f.UsedQuotaSize = 0
+	f.UsedQuotaFiles = 1
+	folderAsJSON, err = json.Marshal(f)
+	assert.NoError(t, err)
+	req, _ = http.NewRequest(http.MethodPut, updateFolderUsedQuotaPath+"?mode=add", bytes.NewBuffer(folderAsJSON))
+	setBearerForReq(req, token)
+	rr = executeRequest(req)
+	checkResponseCode(t, http.StatusOK, rr)
+	folderGet = vfs.BaseVirtualFolder{}
+	req, _ = http.NewRequest(http.MethodGet, path.Join(folderPath, folderName), nil)
+	setBearerForReq(req, token)
+	rr = executeRequest(req)
+	checkResponseCode(t, http.StatusOK, rr)
+	err = render.DecodeJSON(rr.Body, &folderGet)
+	assert.NoError(t, err)
+	assert.Equal(t, usedQuotaFiles*2, folderGet.UsedQuotaFiles)
+	assert.Equal(t, usedQuotaSize*2, folderGet.UsedQuotaSize)
 	req, _ = http.NewRequest(http.MethodPut, updateFolderUsedQuotaPath, bytes.NewBuffer([]byte("string")))
 	setBearerForReq(req, token)
 	rr = executeRequest(req)
diff --git a/httpd/schema/openapi.yaml b/httpd/schema/openapi.yaml
index 17cab74b..013142b8 100644
--- a/httpd/schema/openapi.yaml
+++ b/httpd/schema/openapi.yaml
@@ -428,7 +428,7 @@ paths:
             example: reset
       requestBody:
         required: true
-        description: 'The only folder mandatory fields are mapped_path,used_quota_size and used_quota_files. Please note that if the used quota fields are missing they will default to 0'
+        description: 'The only folder mandatory fields are mapped_path,used_quota_size and used_quota_files. Please note that if the used quota fields are missing they will default to 0, this means that if mode is "add" the current value will remain unchanged, if mode is "reset" the missing field is set to 0'
         content:
           application/json:
             schema: