diff --git a/testcases/kernel/device-drivers/README b/testcases/kernel/device-drivers/README
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+- ACPI testcase -
+        ACPI must be enabled in the kernel. Since ACPI will control devices and possibly put them to sleep,
+        it's not recommended that any other tests be run concurrently with these tests since you may
+        get unexpected results. 
+        These tests are currently ONLY supported on the 2.5 kernels. 2.4 kernels probably won't even build much 
+        less run.
+        run ltpacpi.sh -r run  to execute the tests