diff --git a/konami/identifiers.md b/konami/identifiers.md
index a7a7009..9cd674f 100644
--- a/konami/identifiers.md
+++ b/konami/identifiers.md
@@ -22,14 +22,14 @@ The following variables are used across the different identifiers and can denote
 * `$p`: Product
   * `G`: Game
 * `$t`: Type of product
-  * `C`: Upgrade: software only
-  * `E`: Upgrade: hardware (conversion) kit + software
-  * `K`: Upgrade: offline/no eamuse software version
-  * `N`: ???
-  * `O`: ???
-  * `Q`: Dedicated cabinet assembly/main body
-  * `U`: "Utilities", e.g. DVD software update kit, replacement monitors
-  * `X`: Hardware/board ???
+  * `C`: Conversion? Software only
+  * `E`: Extension? Software + hardware
+  * `K`: Possibility for offline/no e-AMUSEMENT?
+  * `N`: New dedicated cabinet?
+  * `O`: New dedicated cabinet?
+  * `Q`: New dedicated cabinet?
+  * `U`: Upgrade or utility? e.g. DVD software update kit, replacement monitors
+  * `X`: Hardware/board?
 * `$g`: Gamecode, identifies a game or series in [Konami's product portfolio](products.md)
   * Format: `yxx`
     * `y`: `A` + (project development start year - 2000) (`L`: 2011, `T`: 2019, etc.)