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-rw-r--r--Documentation/device-mapper/cache.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt
index e8cdf7241b66..af99c458c841 100644
--- a/Documentation/device-mapper/cache.txt
+++ b/Documentation/device-mapper/cache.txt
@@ -50,7 +50,8 @@ other parameters detailed later):
which are dirty, and extra hints for use by the policy object.
This information could be put on the cache device, but having it
separate allows the volume manager to configure it differently,
- e.g. as a mirror for extra robustness.
+ e.g. as a mirror for extra robustness. This metadata device may only
+ be used by a single cache device.
Fixed block size
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