added PR reference number

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2456ad52bb8fedeaf1b06095939d007b9247f257..7e268161479cdcfafc13df20c0c4a58f8b63d940 100644 (file)
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,7 +26,7 @@ The document follows the conventions described in [“Keep a CHANGELOG”](http:
 ## UNRELEASED 2.4.1
 
 ### Changed
-- change CHANGELOG to follow the conventions described in [“Keep a CHANGELOG”](http://keepachangelog.com).
+- change CHANGELOG to follow the conventions described in [“Keep a CHANGELOG”](http://keepachangelog.com) (#578)
 
 ====