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diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt
index 82fd8228fd4..20d5ec309cb 100644
--- a/Documentation/thinkpad-acpi.txt
+++ b/Documentation/thinkpad-acpi.txt
@@ -710,5 +710,9 @@ enable various classes of debugging output, for example:
will enable all debugging output classes. It takes a bitmask, so
to enable more than one output class, just add their values.
+ Debug bitmask Description
+ 0x0001 Initialization and probing
+ 0x0002 Removal
+
There is also a kernel build option to enable more debugging
information, which may be necessary to debug driver problems.