From 1e3ae14ab3aa353ef57b51df5d8fa7ac6f9a5a11 Mon Sep 17 00:00:00 2001
From: Matthias Plum <mplum@icecube.wisc.edu>
Date: Mon, 30 Oct 2023 09:38:15 -0600
Subject: [PATCH] Update changelog with additional information for IceTop fix

---
 CHANGELOG.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 451c3c4..5f10ac6 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -5,6 +5,14 @@
 Changelog
 =========
 
+main - 2023-10-30
+---------------------
+Update the calculation of IceTop weights to fix an issue with the effective area.
+The fix replaces the CircularInjector with NaturalRateCylinder,
+where the cylinder height is set to zero to mimic the flat surface detector.
+The calculated effective area is the projected area, which can be corrected by
+dividing by cos(zenith).
+
 `0.1.0`_ - 2023-01-24
 ---------------------