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diff --git a/t/README b/t/README
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--- a/t/README
+++ b/t/README
@@ -466,6 +466,12 @@ explicitly providing repositories when accessing submodule objects is
complete or needs to be abandoned for whatever reason (in which case the
migrated codepaths still retain their performance benefits).
+GIT_TEST_REQUIRE_PREREQ=<list> allows specifying a space separated list of
+prereqs that are required to succeed. If a prereq in this list is triggered by
+a test and then fails then the whole test run will abort. This can help to make
+sure the expected tests are executed and not silently skipped when their
+dependency breaks or is simply not present in a new environment.
+
Naming Tests
------------