From cc3391cc1cb9efb41d52a77480f770155062441d Mon Sep 17 00:00:00 2001
From: Christophe Romain <christophe.romain@process-one.net>
Date: Tue, 18 Jul 2017 15:43:46 +0200
Subject: [PATCH] Use string:join instead of lists:join

---
 src/ejabberd_commands_doc.erl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ejabberd_commands_doc.erl b/src/ejabberd_commands_doc.erl
index 8cab8c107..a458cdb9a 100644
--- a/src/ejabberd_commands_doc.erl
+++ b/src/ejabberd_commands_doc.erl
@@ -343,7 +343,7 @@ format_type({list, El}) ->
     io_lib:format("[~s]", [format_type(El)]);
 format_type({tuple, Els}) ->
     Args = [format_type(El) || El <- Els],
-    io_lib:format("{~s}", [lists:flatten(lists:join(", ", Args))]);
+    io_lib:format("{~s}", [string:join(Args, ", ")]);
 format_type({Name, Type}) ->
     io_lib:format("~s::~s", [Name, format_type(Type)]);
 format_type(binary) ->