diff --git a/down-the-stack/solutions/src/lib.rs b/down-the-stack/solutions/src/lib.rs
index 3446a8d..83c2b23 100644
--- a/down-the-stack/solutions/src/lib.rs
+++ b/down-the-stack/solutions/src/lib.rs
@@ -1,5 +1,6 @@
 #![no_std]
 
+// ⚠️ ⚠️ ⚠️ Don't change this file! ⚠️ ⚠️ ⚠️ so it's exactly like apps/src/lib.rs
 use panic_probe as _;
 
 // same panicking *behavior* as `panic-probe` but doesn't print a panic message