diff --git a/cmd/grpcurl/grpcurl.go b/cmd/grpcurl/grpcurl.go
index 618f4af..3edc317 100644
--- a/cmd/grpcurl/grpcurl.go
+++ b/cmd/grpcurl/grpcurl.go
@@ -57,7 +57,9 @@ var (
 	addlHeaders multiString
 	rpcHeaders  multiString
 	reflHeaders multiString
-	data        = flag.String("d", "",
+	authority   = flag.String("authority", "",
+		":authority pseudo header value to be passed along with underlying HTTP/2 requests. It defaults to `host [ \":\" port ]` part of the target url.")
+	data = flag.String("d", "",
 		`JSON request contents. If the value is '@' then the request contents are
     	read from stdin. For calls that accept a stream of requests, the
     	contents should include all such request messages concatenated together
@@ -256,6 +258,9 @@ func main() {
 				Timeout: timeout,
 			}))
 		}
+		if *authority != "" {
+			opts = append(opts, grpc.WithAuthority(*authority))
+		}
 		var creds credentials.TransportCredentials
 		if !*plaintext {
 			var err error