diff --git a/docs/src/developers_guide/contributing_ci_tests.rst b/docs/src/developers_guide/contributing_ci_tests.rst
index 46848166b3..87a3054605 100644
--- a/docs/src/developers_guide/contributing_ci_tests.rst
+++ b/docs/src/developers_guide/contributing_ci_tests.rst
@@ -68,6 +68,13 @@ or simply::
 
 and add the changed lockfiles to your pull request.
 
+.. note::
+
+   If your installation of conda runs through Artifactory or another similar
+   proxy then you will need to amend that lockfile to use URLs that Github
+   Actions can access. A utility to strip out Artifactory exists in the
+   ``ssstack`` tool.
+
 New lockfiles are generated automatically each week to ensure that Iris continues to be
 tested against the latest available version of its dependencies.
 Each week the yaml files in ``requirements/ci`` are resolved by a GitHub Action.
diff --git a/docs/src/whatsnew/dev.rst b/docs/src/whatsnew/dev.rst
index 0ef6c7f65e..85b997125a 100644
--- a/docs/src/whatsnew/dev.rst
+++ b/docs/src/whatsnew/dev.rst
@@ -91,6 +91,8 @@ This document explains the changes made to Iris for this release
 
 #. `@tkknight`_ added a page to show the issues that have been voted for.  See
    :ref:`voted_issues`. (:issue:`3307`, :pull:`4617`)
+#. `@wjbenfold`_ added a note about fixing proxy URLs in lockfiles generated
+   because dependencies have changed. (:pull:`4666`)
 
 
 💼 Internal