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README.md

@@ -48,7 +48,7 @@ The script is more a proof of concept, but maybe you can use it in production if
 - Remove other unnecessary components of the air-gapped computer before using it for key stretching for the first time: video controllers (use the integrated one in the motherboard), network adapters, disk controllers, etc.
 - Never connect the air-gapped computer to other devices you may want to use with other computers in the future. All devices once connected to the air-gapped computer should be considered infected with malware and containing all your secrets.
 - Run the OS from a read only optical disk and make sure that there is no way for a hypothetical malware to write to the optical disk (i.e. use read-only optical drive, do not insert the optical disk into other computer after it's being used). Are you sure that the optical drive is read only? What is under that sticker... 
-- Make sure to not insert the optical disk on other computer (just in case there is a malware writing secrets on your air-gapped computer).
+- Make sure to not insert the optical disk on other computer (just in case there is a malware writing secrets on the optical disk - this theoretically can be done in a way not visible by any standard OS, outside of the filesystem).
 - Do not use USB devices on the air-gapped computer. Because you may forget and insert the same device to another computer.
 - Do not use even USB keyboard or USB mouse. You may forget and attach the keyboard/mouse to an online computer and... it's gone.
 - Read how malware can transmit information from air-gapped computers and take necessary precautions (i.e. flashing status LEDs of the hard drive, emitting sound or ultrasound, modulating the USB signals to make a transmitter).