diff --git a/contrib/completion/zsh/_docker b/contrib/completion/zsh/_docker
index 075e87aa93..d5eeca2413 100644
--- a/contrib/completion/zsh/_docker
+++ b/contrib/completion/zsh/_docker
@@ -2376,7 +2376,8 @@ __docker_system_subcommand() {
                 $opts_help \
                 "($help -a --all)"{-a,--all}"[Remove all unused data, not just dangling ones]" \
                 "($help)*--filter=[Filter values]:filter:__docker_complete_prune_filters" \
-                "($help -f --force)"{-f,--force}"[Do not prompt for confirmation]" && ret=0
+                "($help -f --force)"{-f,--force}"[Do not prompt for confirmation]" \
+                "($help)--volumes=[Remove all unused volumes]" && ret=0
             ;;
         (help)
             _arguments $(__docker_arguments) ":subcommand:__docker_volume_commands" && ret=0