Improved documentation

src/exe/pe/pe.md

@@ -13,6 +13,8 @@ importing a few core functions from "kernel32.dll".
 The section where the DLL function pointers are stored does not need to be marked as writable.
 The Windows executable loader resolves the pointers before they are loaded into memory.
 
+The stack must be 16 byte aligned before a DLL function is called.
+
 ## Links
 
 - https://learn.microsoft.com/en-us/windows/win32/debug/pe-format