diff --git a/documentation/memory.md b/documentation/memory.md
index 0741290..24aca6c 100644
--- a/documentation/memory.md
+++ b/documentation/memory.md
@@ -8,3 +8,15 @@ To activate pagination you must put the physic [pd](./memory/page_directory.md)
 
 Cause create all [pt](./memory/page_table.md) will cost 3MB (768 * 1024 * 4, 768: cause is our heap limite, 1024: cause each pt contains 1024 entry and 4: cause size of pte is 4byte) we decided to create it on the heap and dynamically. So the first pt of the pd (pd[0]) will contain a default_page_table (or heap_pt). Each page create by each the heap_pt will be a pt added to the pd.
 ![](./assets/memory/heap_map.webp)
+
+### Page Directory
+
+|Name|Addresss|
+|----|--------|
+|0|left empty so read or write on NULL triggers an interrupt|
+|1-767|user process allocations|
+|768|kernel code and stack|
+|769-1020|kernel allocations|
+|1021|VBE screen|
+|1022|frame allocator variables|
+|1023|multiboot|
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