diff --git a/contrib/completion/zsh/_docker b/contrib/completion/zsh/_docker
index 3eb8f94478..c0df588c44 100644
--- a/contrib/completion/zsh/_docker
+++ b/contrib/completion/zsh/_docker
@@ -1845,6 +1845,7 @@ __docker_service_subcommand() {
             _arguments $(__docker_arguments) \
                 $opts_help \
                 "($help)*"{-f=,--filter=}"[Filter output based on conditions provided]:filter:->filter-options" \
+                "($help)--format=[Pretty-print services using a Go template]:template: " \
                 "($help -q --quiet)"{-q,--quiet}"[Only display IDs]" && ret=0
             case $state in
                 (filter-options)
@@ -2045,6 +2046,7 @@ __docker_stack_subcommand() {
             _arguments $(__docker_arguments) \
                 $opts_help \
                 "($help)*"{-f=,--filter=}"[Filter output based on conditions provided]:filter:__docker_stack_complete_services_filters" \
+                "($help)--format=[Pretty-print services using a Go template]:template: " \
                 "($help -q --quiet)"{-q,--quiet}"[Only display IDs]" \
                 "($help -):stack:__docker_complete_stacks" && ret=0
             ;;