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-rw-r--r--Documentation/thinkpad-acpi.txt17
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diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt
index fe26e50a2b15..7a06a27ee37b 100644
--- a/Documentation/thinkpad-acpi.txt
+++ b/Documentation/thinkpad-acpi.txt
@@ -134,6 +134,21 @@ end of this document. Changes to the sysfs interface done by the kernel
134subsystems are not documented here, nor are they tracked by this 134subsystems are not documented here, nor are they tracked by this
135attribute. 135attribute.
136 136
137Changes to the thinkpad-acpi sysfs interface are only considered
138non-experimental when they are submitted to Linux mainline, at which
139point the changes in this interface are documented and interface_version
140may be updated. If you are using any thinkpad-acpi features not yet
141sent to mainline for merging, you do so on your own risk: these features
142may disappear, or be implemented in a different and incompatible way by
143the time they are merged in Linux mainline.
144
145Changes that are backwards-compatible by nature (e.g. the addition of
146attributes that do not change the way the other attributes work) do not
147always warrant an update of interface_version. Therefore, one must
148expect that an attribute might not be there, and deal with it properly
149(an attribute not being there *is* a valid way to make it clear that a
150feature is not available in sysfs).
151
137Hot keys 152Hot keys
138-------- 153--------
139 154
@@ -989,3 +1004,5 @@ Sysfs interface changelog:
989 1004
9900x000100: Initial sysfs support, as a single platform driver and 10050x000100: Initial sysfs support, as a single platform driver and
991 device. 1006 device.
10070x000200: Hot key support for 32 hot keys, and radio slider switch
1008 support.