diff --git a/tutorial/task4-calculator.html b/tutorial/converter.html
similarity index 100%
rename from tutorial/task4-calculator.html
rename to tutorial/converter.html
diff --git a/tutorial/index.md b/tutorial/index.md
index 9cbc5e9f..799aa0de 100644
--- a/tutorial/index.md
+++ b/tutorial/index.md
@@ -166,4 +166,4 @@ ask questions or share your experience](http://akkartik.name/contact).
 
 One gotcha to keep in mind is that numbers in Mu must always be in hexadecimal
 notation, starting with `0x`. Use a calculator on your computer or phone to
-convert 42 to hexadecimal, or [this page on your web browser](http://akkartik.github.io/mu/tutorial/task4-calculator.html).
+convert 42 to hexadecimal, or [this page on your web browser](http://akkartik.github.io/mu/tutorial/converter.html).