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-rw-r--r--docs/devel/testing/functional.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/devel/testing/functional.rst b/docs/devel/testing/functional.rst
index 3728bab6c0..fdeaebaadc 100644
--- a/docs/devel/testing/functional.rst
+++ b/docs/devel/testing/functional.rst
@@ -312,6 +312,9 @@ The cache is populated in the ``~/.cache/qemu/download`` directory by
 default, but the location can be changed by setting the
 ``QEMU_TEST_CACHE_DIR`` environment variable.
 
+To force the test suite to re-download the cache, even if still valid,
+set the ``QEMU_TEST_REFRESH_CACHE`` environment variable.
+
 Skipping tests
 --------------