diff --git a/vendor/google.golang.org/grpc/tap/tap.go b/vendor/google.golang.org/grpc/tap/tap.go
index 584360f..07f0125 100644
--- a/vendor/google.golang.org/grpc/tap/tap.go
+++ b/vendor/google.golang.org/grpc/tap/tap.go
@@ -17,11 +17,18 @@
  */
 
 // Package tap defines the function handles which are executed on the transport
-// layer of gRPC-Go and related information. Everything here is EXPERIMENTAL.
+// layer of gRPC-Go and related information.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
 package tap
 
 import (
 	"context"
+
+	"google.golang.org/grpc/metadata"
 )
 
 // Info defines the relevant information needed by the handles.
@@ -29,19 +36,23 @@
 	// FullMethodName is the string of grpc method (in the format of
 	// /package.service/method).
 	FullMethodName string
+
+	// Header contains the header metadata received.
+	Header metadata.MD
+
 	// TODO: More to be added.
 }
 
-// ServerInHandle defines the function which runs before a new stream is created
-// on the server side. If it returns a non-nil error, the stream will not be
-// created and a RST_STREAM will be sent back to the client with REFUSED_STREAM.
-// The client will receive an RPC error "code = Unavailable, desc = stream
-// terminated by RST_STREAM with error code: REFUSED_STREAM".
+// ServerInHandle defines the function which runs before a new stream is
+// created on the server side. If it returns a non-nil error, the stream will
+// not be created and an error will be returned to the client.  If the error
+// returned is a status error, that status code and message will be used,
+// otherwise PermissionDenied will be the code and err.Error() will be the
+// message.
 //
 // It's intended to be used in situations where you don't want to waste the
-// resources to accept the new stream (e.g. rate-limiting). And the content of
-// the error will be ignored and won't be sent back to the client. For other
-// general usages, please use interceptors.
+// resources to accept the new stream (e.g. rate-limiting). For other general
+// usages, please use interceptors.
 //
 // Note that it is executed in the per-connection I/O goroutine(s) instead of
 // per-RPC goroutine. Therefore, users should NOT have any