From bc7c2c91871115601a23bc17fba7977c73c99db1 Mon Sep 17 00:00:00 2001
From: Remko Popma <remkop@yahoo.com>
Date: Mon, 7 Jan 2019 22:32:03 +0900
Subject: [PATCH] [#591] Update RELEASE-NOTES

---
 RELEASE-NOTES.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index cb5dba255..01d7f9015 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -19,6 +19,7 @@ Picocli follows [semantic versioning](http://semver.org/).
 
 ## <a name="3.9.1-fixes"></a> Fixed issues
 - [#592] Error message now shows `enum` constant names, not `toString()` values, after value mismatch. Thanks to [startewho](https://github.com/startewho) for the bug report.
+- [#591] Replace some String concatenation with StringBuilder in `picocli.AutoComplete`. Thanks to [Sergio Escalante](https://github.com/sergioescala) for the pull request.
 
 ## <a name="3.9.1-deprecated"></a> Deprecations
 No features were deprecated in this release.