diff --git a/KEYS.md b/KEYS.md
index ecac87c1af..14f6f1a14a 100644
--- a/KEYS.md
+++ b/KEYS.md
@@ -32,3 +32,11 @@ For example:
 01000000000108000000000000000003 = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 01000000000108000000000000000004 = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 ```
+
+#About keys
+There are 2 types of key files:
+`prod.keys` and `title.keys`.
+* `prod.keys`
+These are typically used to decrypt system files and encrypted game files. Almost every major firmware update adds a new `master_key` so be sure to keep your keys updated if you want to play newer games!
+* `title.keys`
+These are only used for games that are not dumped from cartridges but from games downloaded from the Nintendo eShop, these are also only used if the eShop dump does *not* have a `ticket`. If the game does have a ticket, Ryujinx will read the key directly from that ticket.
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