diff --git a/checking/intro-levels/sub-title.md b/checking/intro-levels/sub-title.md
index 3a78057..4e34f77 100644
--- a/checking/intro-levels/sub-title.md
+++ b/checking/intro-levels/sub-title.md
@@ -1,2 +1,2 @@
-How do the checking levels work?
+What are the checking levels, and what are they used for?