diff --git a/subjects/tolower/README.md b/subjects/tolower/README.md
index 23205146..cdf65f62 100644
--- a/subjects/tolower/README.md
+++ b/subjects/tolower/README.md
@@ -2,7 +2,7 @@
 
 ### Instructions
 
-Write a function that lower cases for each letter of a `string`.
+Write a function that lower cases for each letter in a `string`.
 
 ### Expected function