diff --git a/include/kmultiboot.h b/include/kmultiboot.h
new file mode 100644
index 0000000..9997d53
--- /dev/null
+++ b/include/kmultiboot.h
@@ -0,0 +1,21 @@
+#ifndef KMULTIBOOT_H
+#define KMULTIBOOT_H
+
+typedef struct {
+    uint32_t flags;
+    uint32_t mem_lower;
+    uint32_t mem_upper;
+    uint32_t boot_device;
+    uint32_t cmdline;
+    uint32_t mods_count;
+    uint32_t mods_addr;
+} multiboot_info_t;
+
+typedef struct multiboot_mmap_entry {
+    uint32_t ssize; //size of the entry
+    uint64_t addr; //physical location of memory
+    uint64_t msize;
+    uint32_t type;
+} __attribute__((packed));
+
+#endif
diff --git a/src/main.c b/src/main.c
index bad066f..dbfdc24 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3,16 +3,7 @@
 #include <stdint.h>
 #include "kio.h"
 #include "kttools.h"
-
-typedef struct {
-    uint32_t flags;
-    uint32_t mem_lower;
-    uint32_t mem_upper;
-    uint32_t boot_device;
-    uint32_t cmdline;
-    uint32_t mods_count;
-    uint32_t mods_addr;
-} multiboot_info_t;
+#include "kmultiboot.h"
 
 //finally, main.
 void kern_main(uint32_t multiboot_magic, multiboot_info_t* multiboot_info)
@@ -33,6 +24,6 @@ void kern_main(uint32_t multiboot_magic, multiboot_info_t* multiboot_info)
 
     vga_printf("MEM_LOWER:%X\n", multiboot_info->mem_lower);
     vga_printf("MEM_UPPER:%X\n", multiboot_info->mem_upper);
-        
+     
 }