diff --git a/book/src/language-tour/check.md b/book/src/language-tour/check.md
index 20158bbb..f147264b 100644
--- a/book/src/language-tour/check.md
+++ b/book/src/language-tour/check.md
@@ -1,6 +1,6 @@
 # Check
 
-Check is faster than assert but has weaker guarantees.
+Check is slower than assert but has stronger guarantees.
 You can unpack (1-match) data in a check.
 
 ```gleam