diff --git a/exercises/variables/variables3.rs b/exercises/variables/variables3.rs
index 07b1a521..30ec48ff 100644
--- a/exercises/variables/variables3.rs
+++ b/exercises/variables/variables3.rs
@@ -6,6 +6,6 @@
 fn main() {
     let x = 3;
     println!("Number {}", x);
-    x = 5;
+    x = 5; // don't change this line
     println!("Number {}", x);
 }
diff --git a/exercises/variables/variables5.rs b/exercises/variables/variables5.rs
index 47a68a55..5b2c2fa3 100644
--- a/exercises/variables/variables5.rs
+++ b/exercises/variables/variables5.rs
@@ -4,7 +4,7 @@
 // I AM NOT DONE
 
 fn main() {
-    let number = "3";
+    let number = "3"; // don't change this line
     println!("Number {}", number);
     number = 3;
     println!("Number {}", number);