Added another note

diff --git a/TODO.md b/TODO.md
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 ## Inventory
 [ ] Stackable upgrade items 
 [ ] Each time has an inventory slot, an enable bit as well as a stack count
+[ ] Each stack increases the overall effect
 [ ] Items can be consumed to get temporary buffs (e.g. hp, ammo etc)
 [ ] Each item type has a callback per stat that the stat functions call if unit is player type