diff --git a/OJ notes/pages/Breadth First Search.md b/OJ notes/pages/Breadth First Search.md
index 2d9fd0c..774f8d8 100644
--- a/OJ notes/pages/Breadth First Search.md	
+++ b/OJ notes/pages/Breadth First Search.md	
@@ -12,7 +12,7 @@
 >
 > ##### Difficulty:
 >
-> #CS*analysis #difficulty*
+> #CS_analysis #difficulty_easy 
 >
 > ##### Additional tags: