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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9344d833b7ea..21ae0e4b9e7e 100644
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+++ b/Documentation/kernel-parameters.txt
@@ -3058,6 +3058,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
S [KNL] Run init in single mode
+ s390_iommu= [HW,S390]
+ Set s390 IOTLB flushing mode
+ strict
+ With strict flushing every unmap operation will result in
+ an IOTLB flush. Default is lazy flushing before reuse,
+ which is faster.
+
sa1100ir [NET]
See drivers/net/irda/sa1100_ir.c.