Update README.md

README.md

@@ -582,6 +582,10 @@ Once compiled the assembly will look like this. Note that each reference to symb
 0X13F:                               DrvEntry        endp
 ```
 
+Theo calculates the size of each symbol by subtracting the address of the next symbol (in the same section), from the address of the symbol itself. If the symbol is the last one in a section, the distance between the start of the symbol and the end of the section is used. Now lets take a look at what happens when we link/map this routine.
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 ### Usermode Example
 
 # License - BSD 3-Clause