Add more instructions about dynamic overlay selection feature

Author: pedro-javierf

README.md

@@ -63,6 +63,7 @@ Enable Plugin using `File` -> `Configure` -> `Miscellaneous` -> `NTRGhidraPlugin
 
 Selecting desired overlays after loading:
 
+(**Note**: this REQUIRES the program's original ROM file to be in the exact same file path as when it was imported into Ghidra. )
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