diff --git a/20-defensive/README.md b/20-defensive/README.md
index 2f71aab..8e7cd5a 100644
--- a/20-defensive/README.md
+++ b/20-defensive/README.md
@@ -1,4 +1,4 @@
-Style #19
+Style #20
 ==============================
 
 Constraints: