diff --git a/contrib/completion/bash/docker b/contrib/completion/bash/docker
index 973684a82f..f262559801 100644
--- a/contrib/completion/bash/docker
+++ b/contrib/completion/bash/docker
@@ -2621,6 +2621,7 @@ _docker_service_update() {
 			--container-label
 			--env-file
 			--group
+			--hostname
 			--mode
 			--name
 		"