diff --git a/common_test.go b/common_test.go
index 0f3795d5b..f46b6a8da 100644
--- a/common_test.go
+++ b/common_test.go
@@ -25,10 +25,10 @@ func newTestModel() *TestModel {
 	}
 }
 
-func (t *TestModel) Index(deviceID DeviceID, folder string, files []FileInfo) {
+func (t *TestModel) Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
 }
 
-func (t *TestModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) {
+func (t *TestModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
 }
 
 func (t *TestModel) Request(deviceID DeviceID, folder, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error) {
diff --git a/nativemodel_darwin.go b/nativemodel_darwin.go
index 6001af694..502a71f23 100644
--- a/nativemodel_darwin.go
+++ b/nativemodel_darwin.go
@@ -12,18 +12,18 @@ type nativeModel struct {
 	next Model
 }
 
-func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo) {
+func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
 	for i := range files {
 		files[i].Name = norm.NFD.String(files[i].Name)
 	}
-	m.next.Index(deviceID, folder, files)
+	m.next.Index(deviceID, folder, files, flags, options)
 }
 
-func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) {
+func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
 	for i := range files {
 		files[i].Name = norm.NFD.String(files[i].Name)
 	}
-	m.next.IndexUpdate(deviceID, folder, files)
+	m.next.IndexUpdate(deviceID, folder, files, flags, options)
 }
 
 func (m nativeModel) Request(deviceID DeviceID, folder string, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error) {
diff --git a/nativemodel_unix.go b/nativemodel_unix.go
index 5f7b2e2c4..21585e308 100644
--- a/nativemodel_unix.go
+++ b/nativemodel_unix.go
@@ -10,12 +10,12 @@ type nativeModel struct {
 	next Model
 }
 
-func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo) {
-	m.next.Index(deviceID, folder, files)
+func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
+	m.next.Index(deviceID, folder, files, flags, options)
 }
 
-func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) {
-	m.next.IndexUpdate(deviceID, folder, files)
+func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
+	m.next.IndexUpdate(deviceID, folder, files, flags, options)
 }
 
 func (m nativeModel) Request(deviceID DeviceID, folder string, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error) {
diff --git a/nativemodel_windows.go b/nativemodel_windows.go
index 4859cbaab..951f5b7e6 100644
--- a/nativemodel_windows.go
+++ b/nativemodel_windows.go
@@ -24,7 +24,7 @@ type nativeModel struct {
 	next Model
 }
 
-func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo) {
+func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
 	for i, f := range files {
 		if strings.ContainsAny(f.Name, disallowedCharacters) {
 			if f.IsDeleted() {
@@ -37,10 +37,10 @@ func (m nativeModel) Index(deviceID DeviceID, folder string, files []FileInfo) {
 		}
 		files[i].Name = filepath.FromSlash(f.Name)
 	}
-	m.next.Index(deviceID, folder, files)
+	m.next.Index(deviceID, folder, files, flags, options)
 }
 
-func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) {
+func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option) {
 	for i, f := range files {
 		if strings.ContainsAny(f.Name, disallowedCharacters) {
 			if f.IsDeleted() {
@@ -53,7 +53,7 @@ func (m nativeModel) IndexUpdate(deviceID DeviceID, folder string, files []FileI
 		}
 		files[i].Name = filepath.FromSlash(files[i].Name)
 	}
-	m.next.IndexUpdate(deviceID, folder, files)
+	m.next.IndexUpdate(deviceID, folder, files, flags, options)
 }
 
 func (m nativeModel) Request(deviceID DeviceID, folder string, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error) {
diff --git a/protocol.go b/protocol.go
index 7e2658775..7d742a7fa 100644
--- a/protocol.go
+++ b/protocol.go
@@ -66,9 +66,9 @@ type pongMessage struct{ EmptyMessage }
 
 type Model interface {
 	// An index was received from the peer device
-	Index(deviceID DeviceID, folder string, files []FileInfo)
+	Index(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option)
 	// An index update was received from the peer device
-	IndexUpdate(deviceID DeviceID, folder string, files []FileInfo)
+	IndexUpdate(deviceID DeviceID, folder string, files []FileInfo, flags uint32, options []Option)
 	// A request was made by the peer device
 	Request(deviceID DeviceID, folder string, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error)
 	// A cluster configuration message was received
@@ -80,8 +80,8 @@ type Model interface {
 type Connection interface {
 	ID() DeviceID
 	Name() string
-	Index(folder string, files []FileInfo) error
-	IndexUpdate(folder string, files []FileInfo) error
+	Index(folder string, files []FileInfo, flags uint32, options []Option) error
+	IndexUpdate(folder string, files []FileInfo, flags uint32, options []Option) error
 	Request(folder string, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error)
 	ClusterConfig(config ClusterConfigMessage)
 	Statistics() Statistics
@@ -169,7 +169,7 @@ func (c *rawConnection) Name() string {
 }
 
 // Index writes the list of file information to the connected peer device
-func (c *rawConnection) Index(folder string, idx []FileInfo) error {
+func (c *rawConnection) Index(folder string, idx []FileInfo, flags uint32, options []Option) error {
 	select {
 	case <-c.closed:
 		return ErrClosed
@@ -177,15 +177,17 @@ func (c *rawConnection) Index(folder string, idx []FileInfo) error {
 	}
 	c.idxMut.Lock()
 	c.send(-1, messageTypeIndex, IndexMessage{
-		Folder: folder,
-		Files:  idx,
+		Folder:  folder,
+		Files:   idx,
+		Flags:   flags,
+		Options: options,
 	})
 	c.idxMut.Unlock()
 	return nil
 }
 
 // IndexUpdate writes the list of file information to the connected peer device as an update
-func (c *rawConnection) IndexUpdate(folder string, idx []FileInfo) error {
+func (c *rawConnection) IndexUpdate(folder string, idx []FileInfo, flags uint32, options []Option) error {
 	select {
 	case <-c.closed:
 		return ErrClosed
@@ -193,8 +195,10 @@ func (c *rawConnection) IndexUpdate(folder string, idx []FileInfo) error {
 	}
 	c.idxMut.Lock()
 	c.send(-1, messageTypeIndexUpdate, IndexMessage{
-		Folder: folder,
-		Files:  idx,
+		Folder:  folder,
+		Files:   idx,
+		Flags:   flags,
+		Options: options,
 	})
 	c.idxMut.Unlock()
 	return nil
@@ -463,16 +467,16 @@ func (c *rawConnection) readMessage() (hdr header, msg encodable, err error) {
 
 func (c *rawConnection) handleIndex(im IndexMessage) {
 	if debug {
-		l.Debugf("Index(%v, %v, %d files)", c.id, im.Folder, len(im.Files))
+		l.Debugf("Index(%v, %v, %d file, flags %x, opts: %s)", c.id, im.Folder, len(im.Files), im.Flags, im.Options)
 	}
-	c.receiver.Index(c.id, im.Folder, filterIndexMessageFiles(im.Files))
+	c.receiver.Index(c.id, im.Folder, filterIndexMessageFiles(im.Files), im.Flags, im.Options)
 }
 
 func (c *rawConnection) handleIndexUpdate(im IndexMessage) {
 	if debug {
-		l.Debugf("queueing IndexUpdate(%v, %v, %d files)", c.id, im.Folder, len(im.Files))
+		l.Debugf("queueing IndexUpdate(%v, %v, %d files, flags %x, opts: %s)", c.id, im.Folder, len(im.Files), im.Flags, im.Options)
 	}
-	c.receiver.IndexUpdate(c.id, im.Folder, filterIndexMessageFiles(im.Files))
+	c.receiver.IndexUpdate(c.id, im.Folder, filterIndexMessageFiles(im.Files), im.Flags, im.Options)
 }
 
 func filterIndexMessageFiles(fs []FileInfo) []FileInfo {
diff --git a/protocol_test.go b/protocol_test.go
index c660ba327..3ff1042cb 100644
--- a/protocol_test.go
+++ b/protocol_test.go
@@ -229,8 +229,8 @@ func TestClose(t *testing.T) {
 		t.Error("Ping should not return true")
 	}
 
-	c0.Index("default", nil)
-	c0.Index("default", nil)
+	c0.Index("default", nil, 0, nil)
+	c0.Index("default", nil, 0, nil)
 
 	if _, err := c0.Request("default", "foo", 0, 0, nil, 0, nil); err == nil {
 		t.Error("Request should return an error")
diff --git a/wireformat.go b/wireformat.go
index 23d347e1b..9411955ba 100644
--- a/wireformat.go
+++ b/wireformat.go
@@ -20,7 +20,7 @@ func (c wireFormatConnection) Name() string {
 	return c.next.Name()
 }
 
-func (c wireFormatConnection) Index(folder string, fs []FileInfo) error {
+func (c wireFormatConnection) Index(folder string, fs []FileInfo, flags uint32, options []Option) error {
 	var myFs = make([]FileInfo, len(fs))
 	copy(myFs, fs)
 
@@ -28,10 +28,10 @@ func (c wireFormatConnection) Index(folder string, fs []FileInfo) error {
 		myFs[i].Name = norm.NFC.String(filepath.ToSlash(myFs[i].Name))
 	}
 
-	return c.next.Index(folder, myFs)
+	return c.next.Index(folder, myFs, flags, options)
 }
 
-func (c wireFormatConnection) IndexUpdate(folder string, fs []FileInfo) error {
+func (c wireFormatConnection) IndexUpdate(folder string, fs []FileInfo, flags uint32, options []Option) error {
 	var myFs = make([]FileInfo, len(fs))
 	copy(myFs, fs)
 
@@ -39,7 +39,7 @@ func (c wireFormatConnection) IndexUpdate(folder string, fs []FileInfo) error {
 		myFs[i].Name = norm.NFC.String(filepath.ToSlash(myFs[i].Name))
 	}
 
-	return c.next.IndexUpdate(folder, myFs)
+	return c.next.IndexUpdate(folder, myFs, flags, options)
 }
 
 func (c wireFormatConnection) Request(folder, name string, offset int64, size int, hash []byte, flags uint32, options []Option) ([]byte, error) {