diff --git a/docs/src/whatsnew/latest.rst b/docs/src/whatsnew/latest.rst
index 91d582e037f..482377ee16d 100644
--- a/docs/src/whatsnew/latest.rst
+++ b/docs/src/whatsnew/latest.rst
@@ -93,6 +93,9 @@ This document explains the changes made to Iris for this release
    an issue if the overnight run fails - this was previously an 'invisible'
    problem. (feature branch: :pull:`5432`)
 
+#. `@trexfeathers`_ set `bm_runner.py` to error when the called processes
+   error. This fixes an oversight introduced in :pull:`5215`. (feature branch:
+   :pull`5434`)
 
 .. comment
     Whatsnew author names (@github name) in alphabetical order. Note that,