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-rw-r--r--docs/specs/acpi_mem_hotplug.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplug.txt
index 3df3620ce4..cb26dd27c4 100644
--- a/docs/specs/acpi_mem_hotplug.txt
+++ b/docs/specs/acpi_mem_hotplug.txt
@@ -4,6 +4,9 @@ QEMU<->ACPI BIOS memory hotplug interface
ACPI BIOS GPE.3 handler is dedicated for notifying OS about memory hot-add
and hot-remove events.
+ACPI BIOS GPE.4 handler is dedicated for notifying OS about nvdimm device
+hot-add and hot-remove events.
+
Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access):
---------------------------------------------------------------
0xa00: