diff --git a/31-map-reduce/README.md b/31-map-reduce/README.md
index ccdfcf6..426cc43 100644
--- a/31-map-reduce/README.md
+++ b/31-map-reduce/README.md
@@ -1,4 +1,4 @@
-Style #30
+Style #31
 ==============================
 
 Constraints: