diff --git a/docs/games/iidx31/extras.md b/docs/games/iidx31/extras.md
index 6341e121..b5c82ebe 100644
--- a/docs/games/iidx31/extras.md
+++ b/docs/games/iidx31/extras.md
@@ -18,7 +18,7 @@
 		<soft>
 			<model __type="str">LDJ</model>
 			<dest __type="str">J</dest>
-			<spec __type="str">E</spec>
+			<spec __type="str">B</spec>
 			<rev __type="str">A</rev>
 			<ext __type="str">2024050700</ext>
 		</soft>
@@ -27,10 +27,10 @@
     This is the line that determines if the game will run in Standard (60 FPS) or Lightning (120 FPS) mode.
 
     ```xml
-	<spec __type="str">E</spec>
+	<spec __type="str">B</spec>
     ```
 
-    Use ^^`A`^^ for Standard, or ^^`E`^^ for Lightning.    
+    Use ^^`A`^^ for Standard, or ^^`B`^^ for Lightning.    
     
 ---
 ### Changing the game's language
diff --git a/docs/games/iidx31/setup.md b/docs/games/iidx31/setup.md
index 3fa98655..0cb08dca 100644
--- a/docs/games/iidx31/setup.md
+++ b/docs/games/iidx31/setup.md
@@ -82,7 +82,7 @@
 		<soft>
 			<model __type="str">LDJ</model>
 			<dest __type="str">J</dest>
-			<spec __type="str">E</spec>
+			<spec __type="str">B</spec>
 			<rev __type="str">A</rev>
 			<ext __type="str">2024050700</ext>
 		</soft>
@@ -90,7 +90,7 @@
 
 	On the line with `<spec __type="str">` the letter needs to match your data type:
 	
-	- `E` for TDJ *(010)*
+	- `B` for TDJ *(010)*
 	- `A` for LDJ *(012)*
   
 	Replace the letter accordingly if necessary.