diff --git a/Design-Doc%3A-%60level%60-tool.md b/Design-Doc%3A-%60level%60-tool.md
index bd3d85a..55d539e 100644
--- a/Design-Doc%3A-%60level%60-tool.md
+++ b/Design-Doc%3A-%60level%60-tool.md
@@ -82,7 +82,7 @@ Holds the registry of types and which set of components is associated with each
    * Remember each component ID is 1 byte.
 For (Number of Types):
    (Type Definition Union Size) bytes: List of Component IDs
-       * 00  = No component in this slot, 00's supposed to be at end
+       * FF  = No component in this slot, 00's supposed to be at end
 ```
 
 #### Object Table
@@ -93,7 +93,7 @@ Holds the list of active entities (or Objects). Normally you memcpy this into yo
    * Normally this is 512 but future versions of level may permit customisation.
 For (Object Table Size):
    1 byte: ID of the Type. 
-      * 00 = No object active in this slot
+      * FF = No object active in this slot
       * To dereference Type:
          * Multiply this ID by (Type Definition Union Size)
          * Add that to address of Type Table - 4 bytes