Resolve "Update with list of bug fixes for 4.2.1 release" (3)

source/changes.rst

@@ -28,7 +28,7 @@ List of the main bugfixes in the new 4.2.1 release - May 2023
 **AGRIF zooms**
 
 - Correct freshwater budget computation when using  AGRIF zooms (:mergereq:`162`)
-- Fixed issue with sea surface height (ssh) offset with sea-ice and AGRIF (:mergereq:`120`, :mergereq:`128`, :mergereq:`149`)
+- Fixed issue with sea surface height (ssh) offset with sea-ice and AGRIF (:mergereq:`121`, :mergereq:`128`, :mergereq:`149`)
 
 **Tracers and biogeochemistry TOP**
 
@@ -44,6 +44,7 @@ List of the main bugfixes in the new 4.2.1 release - May 2023
 
 **Diagnostics**
 
+- Correction of the isotherm-depth computation (:mergereq:`288`)
 - Some dia_ar5_hst outputs were wrong (:mergereq:`140`)
 
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