diff --git a/challenges/blockchain/README.md b/challenges/blockchain/README.md
new file mode 100644
index 0000000..b5adacc
--- /dev/null
+++ b/challenges/blockchain/README.md
@@ -0,0 +1,3 @@
+This dir contains challenges that are related to blockchain
+
+## note: am aware that most (or all idk) are not familiar with blockchain category, however due to the nature of the CTF(open to all SOI body), we will try to be inclusive. If there are no submitted blockchain challenges, this category will be removed as a whole.