diff --git a/arch/x86/include/asm/multiboot.h b/arch/x86/include/asm/multiboot.h
index a4adae39..96d123cd 100644
--- a/arch/x86/include/asm/multiboot.h
+++ b/arch/x86/include/asm/multiboot.h
@@ -35,9 +35,11 @@
 
 #ifdef CONFIG_MULTIBOOT
 
-/* are there modules to do something with? */
+/// Does the bootloader provide mem_* fields?
+#define MULTIBOOT_INFO_MEM		0x00000001
+/// Does the bootloader provide a list of modules?
 #define MULTIBOOT_INFO_MODS		0x00000008
-/* is there a full memory map? */
+/// Does the bootloader provide a full memory map?
 #define MULTIBOOT_INFO_MEM_MAP		0x00000040
 
 typedef uint16_t multiboot_uint16_t;
@@ -114,7 +116,6 @@ struct multiboot_info
 	multiboot_uint16_t vbe_interface_off;
 	multiboot_uint16_t vbe_interface_len;
 };
-
 typedef struct multiboot_info multiboot_info_t;
 
 struct multiboot_mmap_entry