diff --git a/endpoints/drive/webdav/file.go b/endpoints/drive/webdav/file.go
index bae07af1..ab1ee410 100644
--- a/endpoints/drive/webdav/file.go
+++ b/endpoints/drive/webdav/file.go
@@ -9,6 +9,7 @@ import (
 	"crypto/sha512"
 	"encoding/xml"
 	"fmt"
+	"github.com/sirupsen/logrus"
 	"io"
 	"io/fs"
 	"net/http"
@@ -121,7 +122,9 @@ func (f *webdavFile) checksum() (string, error) {
 	if _, err := io.Copy(hash, file); err != nil {
 		return "", err
 	}
-	return fmt.Sprintf("%x", hash.Sum(nil)), nil
+	sha512 := fmt.Sprintf("%x", hash.Sum(nil))
+	logrus.Infof("%v = %v", f.name, sha512)
+	return sha512, nil
 }
 
 func (f *webdavFile) updateModtime(path string, modtime time.Time) error {
diff --git a/util/sync/webdavClient/client.go b/util/sync/webdavClient/client.go
index fd4d4d51..cb21a524 100644
--- a/util/sync/webdavClient/client.go
+++ b/util/sync/webdavClient/client.go
@@ -97,6 +97,7 @@ type props struct {
 	ContentType string   `xml:"DAV: prop>getcontenttype,omitempty"`
 	ETag        string   `xml:"DAV: prop>getetag,omitempty"`
 	Modified    string   `xml:"DAV: prop>getlastmodified,omitempty"`
+	Checksum    string   `xml:"zrok: prop>checksum,omitempty"`
 }
 
 type Response struct {
@@ -159,7 +160,7 @@ func (c *Client) ReadDir(path string) ([]os.FileInfo, error) {
 	}
 
 	err := c.propfind(path, false,
-		`<d:propfind xmlns:d='DAV:'>
+		`<d:propfind xmlns:d='DAV:' xmlns:z='zrok:'>
 			<d:prop>
 				<d:displayname/>
 				<d:resourcetype/>
@@ -167,6 +168,8 @@ func (c *Client) ReadDir(path string) ([]os.FileInfo, error) {
 				<d:getcontenttype/>
 				<d:getetag/>
 				<d:getlastmodified/>
+				<z:lastmodified/>
+				<z:checksum/>
 			</d:prop>
 		</d:propfind>`,
 		&Response{},
@@ -211,7 +214,7 @@ func (c *Client) Stat(path string) (os.FileInfo, error) {
 	}
 
 	err := c.propfind(path, true,
-		`<d:propfind xmlns:d='DAV:'>
+		`<d:propfind xmlns:d='DAV:' xmlns:z='zrok:'>
 			<d:prop>
 				<d:displayname/>
 				<d:resourcetype/>
@@ -219,6 +222,7 @@ func (c *Client) Stat(path string) (os.FileInfo, error) {
 				<d:getcontenttype/>
 				<d:getetag/>
 				<d:getlastmodified/>
+				<z:checksum/>
 			</d:prop>
 		</d:propfind>`,
 		&Response{},
diff --git a/util/sync/webdavClient/file.go b/util/sync/webdavClient/file.go
index 0925be67..ce1033ef 100644
--- a/util/sync/webdavClient/file.go
+++ b/util/sync/webdavClient/file.go
@@ -15,6 +15,7 @@ type File struct {
 	modified    time.Time
 	etag        string
 	isdir       bool
+	checksum    string
 }
 
 // Path returns the full path of a file
@@ -62,6 +63,10 @@ func (f File) IsDir() bool {
 	return f.isdir
 }
 
+func (f File) Checksum() string {
+	return f.checksum
+}
+
 // Sys ????
 func (f File) Sys() interface{} {
 	return nil