Update README.md

README.md

@@ -40,6 +40,7 @@ While being simple, Picocrypt also strives to be powerful in the hands of knowle
 <ul>
 	<li><strong>Password generator</strong>: Picocrypt provides a secure password generator that you can use to create cryptographically secure passwords. You can customize the password length, as well as the types of characters to include.</li>
 	<li><strong>File metadata</strong>: Use this to store notes, information, and text along with the file (it won't be encrypted). For example, you can put a description of the file you're encrypting before sending it to someone. When the person you sent it to drops the file into Picocrypt, your description will be shown to that person.</li>
+	<li><strong>Keyfiles</strong>: Picocrypt supports the use of keyfiles as an additional form of authentication (or the only form of authentication). Not only can you use multiple keyfiles, but you can also require the correct order of keyfiles to be present, for a successful decryption to occur. A particularly good use case of multiple keyfiles is creating a shared volume, where each person holds a keyfile, and all of them (and their keyfiles) must be present in order to decrypt the shared volume.</li>
 	<li><strong>Fast mode</strong>: Using this mode will greatly speed up encryption/decryption. In this mode, BLAKE2b will be used to authenticate data instead of SHA3. Doing this provides higher speeds, but at a slightly lower security margin.</li>
 	<li><strong>Paranoid mode</strong>: Using this mode will encrypt your data with both XChaCha20 and Serpent in a cascade fashion. This is recommended for protecting top-secret files and provides the highest level of practical security attainable. In order for a hacker to crack your encrypted data, both the XChaCha20 cipher and the Serpent cipher must be broken, assuming you've chosen a good password.</li>
 	<li><strong>Prevent corruption using Reed-Solomon</strong>: This feature is very useful if you are planning to archive important data on a cloud provider or external medium for a long time. If checked, Picocrypt will use the Reed-Solomon error correction code to add 8 extra bytes for every 128 bytes to prevent file corruption. This means that up to ~3% of your file can corrupt and Picocrypt will still be able to correct the errors and decrypt your files with no corruption. Of course, if your file corrupts very badly (e.g., you dropped your hard drive), Picocrypt won't be able to fully recover your files, but it will try its best to recover what it can. Note that this option will slow down encryption and decryption considerably.</li>