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diff --git a/t/README b/t/README
index c300fa2f50..51065d0800 100644
--- a/t/README
+++ b/t/README
@@ -452,6 +452,16 @@ GIT_TEST_CHECKOUT_WORKERS=<n> overrides the 'checkout.workers' setting
to <n> and 'checkout.thresholdForParallelism' to 0, forcing the
execution of the parallel-checkout code.
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=<boolean>, when true, makes
+registering submodule ODBs as alternates a fatal action. Support for
+this environment variable can be removed once the migration to
+explicitly providing repositories when accessing submodule objects is
+complete (in which case we might want to replace this with a trace2
+call so that users can make it visible if accessing submodule objects
+without an explicit repository still happens) or needs to be abandoned
+for whatever reason (in which case the migrated codepaths still retain
+their performance benefits).
+
Naming Tests
------------