diff --git a/README.md b/README.md
index 53f2a4b..8ea40c7 100644
--- a/README.md
+++ b/README.md
@@ -81,8 +81,13 @@ 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