diff --git a/README.md b/README.md
index 23a4a1d..5f6e7a6 100644
--- a/README.md
+++ b/README.md
@@ -87,8 +87,13 @@ cargo install just # Similar to makefile
 
 ## Build the app
 ```shell
-just build
+just build-epsilon
 ```
+for Epsilon or
+```shell
+just build-upsilon
+```
+for Upsilon.
 
 ## Build and send the app to an actual calculator