diff --git a/vendor/google.golang.org/protobuf/internal/detectknown/detect.go b/vendor/google.golang.org/protobuf/internal/detectknown/detect.go
new file mode 100644
index 0000000..091c423
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/detectknown/detect.go
@@ -0,0 +1,47 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package detectknown provides functionality for detecting well-known types
+// and identifying them by name.
+package detectknown
+
+import "google.golang.org/protobuf/reflect/protoreflect"
+
+type ProtoFile int
+
+const (
+	Unknown ProtoFile = iota
+	AnyProto
+	TimestampProto
+	DurationProto
+	WrappersProto
+	StructProto
+	FieldMaskProto
+	EmptyProto
+)
+
+var wellKnownTypes = map[protoreflect.FullName]ProtoFile{
+	"google.protobuf.Any":         AnyProto,
+	"google.protobuf.Timestamp":   TimestampProto,
+	"google.protobuf.Duration":    DurationProto,
+	"google.protobuf.BoolValue":   WrappersProto,
+	"google.protobuf.Int32Value":  WrappersProto,
+	"google.protobuf.Int64Value":  WrappersProto,
+	"google.protobuf.UInt32Value": WrappersProto,
+	"google.protobuf.UInt64Value": WrappersProto,
+	"google.protobuf.FloatValue":  WrappersProto,
+	"google.protobuf.DoubleValue": WrappersProto,
+	"google.protobuf.BytesValue":  WrappersProto,
+	"google.protobuf.StringValue": WrappersProto,
+	"google.protobuf.Struct":      StructProto,
+	"google.protobuf.ListValue":   StructProto,
+	"google.protobuf.Value":       StructProto,
+	"google.protobuf.FieldMask":   FieldMaskProto,
+	"google.protobuf.Empty":       EmptyProto,
+}
+
+// Which identifies the proto file that a well-known type belongs to.
+func Which(s protoreflect.FullName) ProtoFile {
+	return wellKnownTypes[s]
+}