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-rw-r--r--Documentation/power/states.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/power/states.txt b/Documentation/power/states.txt
index 008ecb588317..8a39ce45d8a0 100644
--- a/Documentation/power/states.txt
+++ b/Documentation/power/states.txt
@@ -35,7 +35,9 @@ only one way to cause the system to go into the Suspend-To-RAM state (write
The default suspend mode (ie. the one to be used without writing anything into
/sys/power/mem_sleep) is either "deep" (if Suspend-To-RAM is supported) or
"s2idle", but it can be overridden by the value of the "mem_sleep_default"
-parameter in the kernel command line.
+parameter in the kernel command line. On some ACPI-based systems, depending on
+the information in the FADT, the default may be "s2idle" even if Suspend-To-RAM
+is supported.
The properties of all of the sleep states are described below.