diff --git a/IMPACT.md b/IMPACT.md
index b57a0dfe0..44a3fc0a4 100644
--- a/IMPACT.md
+++ b/IMPACT.md
@@ -8,7 +8,7 @@ To build it yourself, clone and setup Baritone (instructions in main README.md).
 
 Copy the jar into place. It should be `build/libs/baritone-1.0.0.jar` in baritone. Copy it to your libraries in your Minecraft install. For example, on Mac I do `cp Documents/baritone/build/libs/baritone-1.0.0.jar Library/Application\ Support/minecraft/libraries/cabaletta/baritone/1.0.0/baritone-1.0.0.jar`. The first time you'll need to make the directory `cabaletta/baritone/1.0.0` in libraries first.
 
-Then, we'll need to modify the Impact launch json. Open `minecraft/versions/1.12.2-Impact_4.3/1.12.2-Impact_4.3.json`.
+Then, we'll need to modify the Impact launch json. Open `minecraft/versions/1.12.2-Impact_4.3/1.12.2-Impact_4.3.json` or copy your existing installation and rename the version folder, json, and id in the json.
 
 - Add the Baritone tweak class to line 7 "minecraftArguments" like so: `"minecraftArguments": " ... --tweakClass clientapi.load.ClientTweaker --tweakClass baritone.launch.BaritoneTweakerOptifine",`. You need the Optifine tweaker even though there is no Optifine involved, for reasons I don't quite understand.
 - Add the Baritone library. Insert `{ "name": "cabaletta:baritone:1.0.0" },` between Impact and ClientAPI, which should be between lines 15 and 16.