diff --git a/go/lab_platform/stable_firmware_version.pb.go b/go/lab_platform/stable_firmware_version.pb.go
index 63be0f0..cd17485 100644
--- a/go/lab_platform/stable_firmware_version.pb.go
+++ b/go/lab_platform/stable_firmware_version.pb.go
@@ -26,7 +26,7 @@
 
 // StableFirmwareVersion is an association between a given ChromeOS version
 // and a string uniquely identifying the firmware version.
-// next tag: 3
+// next tag: 4
 type StableFirmwareVersion struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -34,6 +34,16 @@
 
 	Key     *StableVersionKey `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	Version string            `protobuf:"bytes,2,opt,name=version,proto3" json:"version,omitempty"`
+	// A fragment of the Google Storage location for a firmware image.
+	// The motivating use case is the devserver API as of 2021 Q1.
+	//
+	// e.g. "SOMEBOARD-firmware/R80-14444.333.0", which maps to
+	// gs://some-bucket/[[image]]/name-of-firmware-bundle.tgz .
+	//
+	// This fragment can be consumed by the devserver API and permits
+	// users to download an firmware bundle without downloading
+	// the entire OS image that it is part of.
+	Image string `protobuf:"bytes,3,opt,name=image,proto3" json:"image,omitempty"`
 }
 
 func (x *StableFirmwareVersion) Reset() {
@@ -82,6 +92,13 @@
 	return ""
 }
 
+func (x *StableFirmwareVersion) GetImage() string {
+	if x != nil {
+		return x.Image
+	}
+	return ""
+}
+
 var File_lab_platform_stable_firmware_version_proto protoreflect.FileDescriptor
 
 var file_lab_platform_stable_firmware_version_proto_rawDesc = []byte{
@@ -91,17 +108,18 @@
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 }
 
 var (
diff --git a/src/lab_platform/stable_firmware_version.proto b/src/lab_platform/stable_firmware_version.proto
index b434f22..c320cb1 100644
--- a/src/lab_platform/stable_firmware_version.proto
+++ b/src/lab_platform/stable_firmware_version.proto
@@ -12,8 +12,19 @@
 
 // StableFirmwareVersion is an association between a given ChromeOS version
 // and a string uniquely identifying the firmware version.
-// next tag: 3
+// next tag: 4
 message StableFirmwareVersion {
     StableVersionKey key = 1;
     string version = 2;
+
+    // A fragment of the Google Storage location for a firmware image.
+    // The motivating use case is the devserver API as of 2021 Q1.
+    //
+    // e.g. "SOMEBOARD-firmware/R80-14444.333.0", which maps to
+    // gs://some-bucket/[[image]]/name-of-firmware-bundle.tgz .
+    //
+    // This fragment can be consumed by the devserver API and permits
+    // users to download an firmware bundle without downloading
+    // the entire OS image that it is part of.
+    string image = 3;
 }