diff --git a/keyboards/mariorion_v25/readme.md b/keyboards/mariorion_v25/readme.md
index aed39d15d7b..46843acbdce 100644
--- a/keyboards/mariorion_v25/readme.md
+++ b/keyboards/mariorion_v25/readme.md
@@ -16,6 +16,7 @@ Make example for this keyboard (after setting up your build environment):
 Flashing example for this keyboard:
 
     make mariorion_v25/prod:default:flash
+    make mariorion_v25/proto:default:flash
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).