diff --git a/Makefile b/Makefile
index f1accc2da..29551e6bd 100644
--- a/Makefile
+++ b/Makefile
@@ -247,3 +247,4 @@ $(foreach tt,$(ALL_ELIXIR_TGZS),$(eval $(call gen-elixir-tgz-target,$(tt))))
 .PHONY: fmt
 fmt: $(REBAR)
 	@./scripts/erlfmt -w '{apps,lib-ee}/*/{src,include,test}/**/*.{erl,hrl,app.src}'
+	@./scripts/erlfmt -w 'rebar.config.erl'
diff --git a/rebar.config.erl b/rebar.config.erl
index 4b7fc1515..1da448495 100644
--- a/rebar.config.erl
+++ b/rebar.config.erl
@@ -393,7 +393,9 @@ etc_overlay(ReleaseType, Edition) ->
     Templates = emqx_etc_overlay(ReleaseType, Edition),
     [
         {mkdir, "etc/"},
-        {copy, "{{base_dir}}/lib/emqx/etc/certs", "etc/"}
+        {copy, "{{base_dir}}/lib/emqx/etc/certs", "etc/"},
+        {copy, "{{base_dir}}/lib/emqx_dashboard/etc/emqx-en.conf.example", "etc/"},
+        {copy, "{{base_dir}}/lib/emqx_dashboard/etc/emqx-zh.conf.example", "etc/"}
     ] ++
         lists:map(
             fun