diff --git a/src/acpi/Kconfig b/src/acpi/Kconfig
index 816f9fb31e..ec7fcc4b08 100644
--- a/src/acpi/Kconfig
+++ b/src/acpi/Kconfig
@@ -11,9 +11,10 @@ config ACPI_CPU_STRING
 	default "\\_SB.CP%02X"
 	depends on HAVE_ACPI_TABLES
 	help
-	  Sets the ACPI name string in the processor scope as written by
-	  the acpigen function. Default is \_SB.CPxx. Note that you need
-	  the \ escape character in the string.
+	  Specifies the ACPI name format string used by the acpigen
+	  function to generate the processor scope. Default is \_SB.CPxx.
+	  Note that you need to escape the '\' character in the string.
+	  The resulting string will be truncated to at most 15 chars.
 
 config ACPI_HAVE_PCAT_8259
 	def_bool y if !ACPI_NO_PCAT_8259