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-rw-r--r--docs/qcow2-cache.txt5
1 files changed, 3 insertions, 2 deletions
diff --git a/docs/qcow2-cache.txt b/docs/qcow2-cache.txt
index 5bb06072d3..1fdd6f9ce7 100644
--- a/docs/qcow2-cache.txt
+++ b/docs/qcow2-cache.txt
@@ -160,5 +160,6 @@ If unset, the default value for this parameter is 0 and it disables
this feature.
Note that this functionality currently relies on the MADV_DONTNEED
-argument for madvise() to actually free the memory, so it is not
-useful in systems that don't follow that behavior.
+argument for madvise() to actually free the memory. This is a
+Linux-specific feature, so cache-clean-interval is not supported in
+other systems.