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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e9acd5540d2..d006e8b66ff 100644
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+++ b/Documentation/kernel-parameters.txt
@@ -1274,6 +1274,8 @@ and is between 256 and 4096 characters. It is defined in the file
noaer [PCIE] If the PCIEAER kernel config parameter is
enabled, this kernel boot option can be used to
disable the use of PCIE advanced error reporting.
+ nodomains [PCI] Disable support for multiple PCI
+ root domains (aka PCI segments, in ACPI-speak).
nommconf [X86-32,X86_64] Disable use of MMCONFIG for PCI
Configuration
nomsi [MSI] If the PCI_MSI kernel config parameter is