What about the following help text (white space damage by gmail)?

---
 drivers/acpi/Kconfig |   10 ++++++++++
 1 file changed, 10 insertions(+)

Index: linux-pm/drivers/acpi/Kconfig
===================================================================

--- linux-pm.orig/drivers/acpi/Kconfig
+++ linux-pm/drivers/acpi/Kconfig

@@ -548,3 +548,13 @@ config ACPI_PRMT
     bool "Platform Runtime Mechanism Support"
     depends on EFI && X86_64
     default y
+    help
+      Platform Runtime Mechanism (PRM) is a firmware interface exposing a
+      set of binary executables that can be called from the AML interpreter
+      or directly from device drivers.
+
+      Say Y to enable the AML interpreter to execute the PRM code.
+
+      While this feature is optional in principle, leaving it out may
+      substantially increase computational overhead related to the
+      initialization of some server systems.