diff --git a/tests/tests1.rs b/tests/tests1.rs
index 15f810a9..e189f937 100644
--- a/tests/tests1.rs
+++ b/tests/tests1.rs
@@ -1,3 +1,7 @@
+// Tests are important to ensure that your code does what you think it should do.
+// Tests can be run on this file with the following command:
+// rustc --test tests1.rs
+
 // This test has a problem with it -- make the test compile! Make the test
 // pass! Make the test fail! Scroll down for hints :)