diff --git a/ChangeLog b/ChangeLog
index 1489cf6a33856511454deb8a4f5549f216ffffbd..96feb1df34bd34c82887aaa05254e5a0cd86f22f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+1600.	[bug]		fdupont
+	Fixed prefixLengthFromRange() routine.
+	(Gitlab #583.!377, git 10bd31217d8a0a77345c4cba7a59314f70c1b509)
+
 1599.	[perf]		marcin
 	Improved performance of the DHCPv6 server running with High
 	Availability by aggregating multiple lease updates in a single