diff --git a/Packages/Interval_arithmetic/changes.txt b/Packages/Interval_arithmetic/changes.txt
index 59a3f8cb8fd..4914eb99647 100644
--- a/Packages/Interval_arithmetic/changes.txt
+++ b/Packages/Interval_arithmetic/changes.txt
@@ -1,3 +1,5 @@
+Version 4.166 on 13 May 2003 [af]
+- Removed a forgotten #include <CGAL/Interval_base.h>
 
 Version 4.165 on 11 May 2003 [af]
 - Removed Interval_base