diff --git a/userguide.md b/userguide.md
index 4ae3648..67901df 100644
--- a/userguide.md
+++ b/userguide.md
@@ -18,17 +18,21 @@ Each room folder needs at least the following images. Every other file is option
 - ROOF
 - WALL
 
-If the following optional images aren't included, they'll be automatically filled in with a transparent png file.
+If the following optional images aren't included, they'll be automatically filled in with a transparent PNG file.
 
 - MINI
 - INTERACT
 - LAYER
 
-If the following optional audios aren't included, they'll be automatically filled in with a silent wav file.
+If the following optional audios aren't included, they'll be automatically filled in with a silent WAV file.
 
 - FOOT
 - MUSIC
 
+You should also include the following file to configure your room. Information about this file is below.
+
+- ROOM.INI
+
 ## File Formats
 
 Per BAP's readme file, here's a list of accepted file formats. Read BAP's readme file for engine limitations.