diff --git a/src/kernel/include/debug.h b/src/kernel/include/debug.h
index 3083eae..76b29fb 100644
--- a/src/kernel/include/debug.h
+++ b/src/kernel/include/debug.h
@@ -18,11 +18,6 @@
 #define debug_error(...)
 #endif
 
-void debug_printf(char *fmt, ...);
-void debug_puts(char *s);
-void debug_putsn(char *s, size_t n);
-void debug_putsh(char c);
-
 #define S(x) #x
 #define S_(x) S(x)
 #define S__LINE__ S_(__LINE__)
@@ -37,4 +32,9 @@ void debug_putsh(char c);
             if(_override) break; \
         } \
     }while(0)
-    
\ No newline at end of file
+    
+// boot/debug.c
+void debug_printf(char *fmt, ...);
+void debug_puts(char *s);
+void debug_putsn(char *s, size_t n);
+void debug_putsh(char c);
\ No newline at end of file
diff --git a/src/kernel/include/multiboot.h b/src/kernel/include/multiboot.h
index 7078b18..17f989d 100644
--- a/src/kernel/include/multiboot.h
+++ b/src/kernel/include/multiboot.h
@@ -24,8 +24,10 @@ struct kernel_boot_data_st{
 
 #define MMAP_FREE 1
 
+// boot/kmain.c
 extern struct kernel_boot_data_st kernel_boot_data;
 
+// boot/multiboot.c
 int multiboot_init(uint64_t magic, void *mboot_info);
 int multiboot_get_memory_area(size_t index, uintptr_t *start, uintptr_t *end, uint32_t *type);
 #endif
\ No newline at end of file
diff --git a/src/kernel/include/vga.h b/src/kernel/include/vga.h
index 03fda32..eab39d6 100644
--- a/src/kernel/include/vga.h
+++ b/src/kernel/include/vga.h
@@ -3,5 +3,6 @@
 
 #define VGA_MEMORY P2V(0xB8000)
 
+// drivers/vga.c
 void vga_init();
 void vga_write(char c);
\ No newline at end of file