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diff --git a/mdadm.8.in b/mdadm.8.in
index 6f0f6c1..b715950 100644
--- a/mdadm.8.in
+++ b/mdadm.8.in
@@ -3197,6 +3197,11 @@ environment. This can be useful for testing or for disaster
recovery. You should be aware that interoperability may be
compromised by setting this value.
+These change can also be suppressed by adding
+.B mdadm.imsm.test=1
+to the kernel command line. This makes it easy to test IMSM
+code in a virtual machine that doesn't have IMSM virtual hardware.
+
.TP
.B MDADM_GROW_ALLOW_OLD
If an array is stopped while it is performing a reshape and that