diff --git a/src/arch/x86/bios/SConscript b/src/arch/x86/bios/SConscript
index 904fab086..1ec717b11 100644
--- a/src/arch/x86/bios/SConscript
+++ b/src/arch/x86/bios/SConscript
@@ -59,7 +59,10 @@ Import('*')
 
 if env['TARGET_ISA'] == 'x86':
     if env['FULL_SYSTEM']:
+        # The table generated by the bootloader using the BIOS and passed to
+        # the operating system which maps out physical memory.
         SimObject('E820.py')
         Source('e820.cc')
 
+        # The DMI tables.
 	Source('smbios.cc')