diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Fixes
 
+- Fixed Monitor duration calculation ([#3420]https://github.com/getsentry/sentry-dotnet/pull/3420)
 - Fixed null IServiceProvider in anonymous routes with OpenTelemetry ([#3401](https://github.com/getsentry/sentry-dotnet/pull/3401))
 - Fixed Trim warnings in Sentry.DiagnosticSource and WinUIUnhandledException integrations ([#3410](https://github.com/getsentry/sentry-dotnet/pull/3410))