diff --git a/subjects/capitalize/README.md b/subjects/capitalize/README.md
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--- a/subjects/capitalize/README.md
+++ b/subjects/capitalize/README.md
@@ -4,7 +4,7 @@
 
 Write a function that capitalizes the first letter of each word **and** lowercases the rest.
 
-A word is a sequence of **alphanumerical** characters.
+A word is a sequence of **alphanumeric** characters.
 
 ### Expected function