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-rw-r--r--Documentation/device-mapper/thin-provisioning.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/device-mapper/thin-provisioning.txt b/Documentation/device-mapper/thin-provisioning.txt
index ef639960b272..3852dade03e4 100644
--- a/Documentation/device-mapper/thin-provisioning.txt
+++ b/Documentation/device-mapper/thin-provisioning.txt
@@ -396,3 +396,6 @@ ii) Status
If the pool has encountered device errors and failed, the status
will just contain the string 'Fail'. The userspace recovery
tools should then be used.
+
+ In the case where <nr mapped sectors> is 0, there is no highest
+ mapped sector and the value of <highest mapped sector> is unspecified.