diff --git a/main.go b/main.go
index cb9204f..b7896cb 100644
--- a/main.go
+++ b/main.go
@@ -9,13 +9,13 @@ import (
 
 // CLI of this Function.
 type CLI struct {
-	Debug bool `help:"Emit debug logs in addition to info logs." short:"d"`
+	Debug bool `env:"DEBUG" help:"Emit debug logs in addition to info logs." short:"d"`
 
-	Network            string `default:"tcp"                                                                                        help:"Network on which to listen for gRPC connections."`
-	Address            string `default:":9443"                                                                                      help:"Address at which to listen for gRPC connections."`
-	TLSCertsDir        string `env:"TLS_SERVER_CERTS_DIR"                                                                           help:"Directory containing server certs (tls.key, tls.crt) and the CA used to verify client certificates (ca.crt)"`
-	Insecure           bool   `help:"Run without mTLS credentials. If you supply this flag --tls-server-certs-dir will be ignored."`
-	MaxRecvMessageSize int    `default:"4"                                                                                          help:"Maximum size of received messages in MB."`
+	Network            string `default:"tcp"              env:"NETWORK"                                                                                                      help:"Network on which to listen for gRPC connections."`
+	Address            string `default:":9443"            env:"ADDRESS"                                                                                                      help:"Address at which to listen for gRPC connections."`
+	TLSCertsDir        string `env:"TLS_SERVER_CERTS_DIR" help:"Directory containing server certs (tls.key, tls.crt) and the CA used to verify client certificates (ca.crt)"`
+	Insecure           bool   `env:"INSECURE"             help:"Run without mTLS credentials. If you supply this flag --tls-server-certs-dir will be ignored."`
+	MaxRecvMessageSize int    `default:"4"                env:"MAX_RECV_MESSAGE_SIZE"                                                                                        help:"Maximum size of received messages in MB"`
 }
 
 // Run this Function.