diff --git a/discovery/.api b/discovery/.api
index 6fc8be6..0174f42 100644
--- a/discovery/.api
+++ b/discovery/.api
@@ -9,6 +9,7 @@
 pkg discovery, type AdvertiseCloser interface, Close()
 pkg discovery, type Advertiser interface { Advertise }
 pkg discovery, type Advertiser interface, Advertise(*context.T, *Service, []security.BlessingPattern) (<-chan struct{}, error)
+pkg discovery, type Attachments map[string][]byte
 pkg discovery, type Attributes map[string]string
 pkg discovery, type Closer interface { Close }
 pkg discovery, type Closer interface, Close()
@@ -23,6 +24,7 @@
 pkg discovery, type Scanner interface, Scan(*context.T, string) (<-chan Update, error)
 pkg discovery, type Service struct
 pkg discovery, type Service struct, Addrs []string
+pkg discovery, type Service struct, Attachments Attachments
 pkg discovery, type Service struct, Attrs Attributes
 pkg discovery, type Service struct, InstanceId string
 pkg discovery, type Service struct, InstanceName string
diff --git a/discovery/types.vdl b/discovery/types.vdl
index b915af8..b48dd1e 100644
--- a/discovery/types.vdl
+++ b/discovery/types.vdl
@@ -20,6 +20,11 @@
 	// The addresses (vanadium object names) that the service is served on.
 	// E.g., '/host:port/a/b/c', '/ns.dev.v.io:8101/blah/blah'.
 	Addrs []string
+	// The service attachments.
+	// E.g., {'thumbnail': binary_data }.
+	//
+	// WARNING: THIS FIELD IS NOT SUPPORTED YET.
+	Attachments Attachments
 }
 
 // Attributes represents service attributes as a key/value pair.
@@ -28,6 +33,15 @@
 // and should not start with '_' character.
 type Attributes map[string]string
 
+// Attachments represents service attachments as a key/value pair. Unlike
+// attributes, attachments are mostly for larger binary data and they are
+// not queryable. It is recommended to put as small attachments as possible
+// since it may require additional RPC calls causing delay in discovery.
+//
+// The key must be US-ASCII printable characters, excluding the '=' character
+// and should not start with '_' character.
+type Attachments map[string][]byte
+
 // Found represents a service that is discovered by scan.
 type Found struct {
 	Service Service
diff --git a/discovery/types.vdl.go b/discovery/types.vdl.go
index d3cec69..9f613b7 100644
--- a/discovery/types.vdl.go
+++ b/discovery/types.vdl.go
@@ -28,6 +28,11 @@
 	// The addresses (vanadium object names) that the service is served on.
 	// E.g., '/host:port/a/b/c', '/ns.dev.v.io:8101/blah/blah'.
 	Addrs []string
+	// The service attachments.
+	// E.g., {'thumbnail': binary_data }.
+	//
+	// WARNING: THIS FIELD IS NOT SUPPORTED YET.
+	Attachments Attachments
 }
 
 func (Service) __VDLReflect(struct {
@@ -46,6 +51,20 @@
 }) {
 }
 
+// Attachments represents service attachments as a key/value pair. Unlike
+// attributes, attachments are mostly for larger binary data and they are
+// not queryable. It is recommended to put as small attachments as possible
+// since it may require additional RPC calls causing delay in discovery.
+//
+// The key must be US-ASCII printable characters, excluding the '=' character
+// and should not start with '_' character.
+type Attachments map[string][]byte
+
+func (Attachments) __VDLReflect(struct {
+	Name string `vdl:"v.io/v23/discovery.Attachments"`
+}) {
+}
+
 // Found represents a service that is discovered by scan.
 type Found struct {
 	Service Service
@@ -108,6 +127,7 @@
 func init() {
 	vdl.Register((*Service)(nil))
 	vdl.Register((*Attributes)(nil))
+	vdl.Register((*Attachments)(nil))
 	vdl.Register((*Found)(nil))
 	vdl.Register((*Lost)(nil))
 	vdl.Register((*Update)(nil))