diff --git a/boot/intro.txt b/boot/intro.txt
index b3cba46..48cb259 100644
--- a/boot/intro.txt
+++ b/boot/intro.txt
@@ -3,6 +3,10 @@ File: Introduction
 Section: Legacy
 
 >
+> +------------+  multiboot
+> |    GRUB    |-------------+
+> +------------+             |
+>       OR                   v
 > +------------+       +-------------+       +--------------+
 > | bootsector |------>| stpdldr.sys |------>| vmstupid.sys |
 > +------------+       +-------------+       +--------------+
diff --git a/kernel/intro.txt b/kernel/intro.txt
index 1cb5cdd..d56ae50 100644
--- a/kernel/intro.txt
+++ b/kernel/intro.txt
@@ -1,22 +1,24 @@
+File: Introduction
+
 About: kernel memory map
 
->  
->               Physical map 
->             +---------------+
->             |               |
->             +---------------+
->             | ISA hole ?    |
->  0x00F00000 +---------------+
->             | RAM           | 
->             +---------------+   
->             |  kernel       |
->  0x00100000 +---------------+       
->             | ROM           |       
->  0x000BFFFF +---------------+      
->             | video display |       
->             |    memory     |       
->  0x0009FFFF +---------------+    
->             |     RAM       |
->             |               |
->  0x00000000 +---------------+ 
->  
+>
+> Physical map 
+>            +---------------+
+>            |               |
+>            +---------------+
+>            | ISA hole ?    |
+> 0x00F00000 +---------------+
+>            | RAM           | 
+>            +---------------+   
+>            |  kernel       |
+> 0x00100000 +---------------+       
+>            | ROM           |       
+> 0x000BFFFF +---------------+      
+>            | video display |       
+>            |    memory     |       
+> 0x0009FFFF +---------------+    
+>            |     RAM       |
+>            |               |
+> 0x00000000 +---------------+ 
+>
diff --git a/kernel/mm/pmm.inc b/kernel/mm/pmm.inc
index e69de29..7bd0779 100644
--- a/kernel/mm/pmm.inc
+++ b/kernel/mm/pmm.inc
@@ -0,0 +1,3 @@
+struc
+{
+}