diff --git a/worlds/dkc3/docs/setup_en.md b/worlds/dkc3/docs/setup_en.md
index 3cb3db0a..471248de 100644
--- a/worlds/dkc3/docs/setup_en.md
+++ b/worlds/dkc3/docs/setup_en.md
@@ -69,7 +69,7 @@ validator page: [YAML Validation page](/mysterycheck)
 
 When you join a multiworld game, you will be asked to provide your config file to whoever is hosting. Once that is done,
 the host will provide you with either a link to download your patch file, or with a zip file containing everyone's patch
-files. Your patch file should have a `.apsm` extension.
+files. Your patch file should have a `.apdkc3` extension.
 
 Put your patch file on your desktop or somewhere convenient, and double click it. This should automatically launch the
 client, and will also create your ROM in the same place as your patch file.