diff --git a/packages/airdrop/README.md b/packages/airdrop/README.md
index 24d486d..e47cf0f 100644
--- a/packages/airdrop/README.md
+++ b/packages/airdrop/README.md
@@ -7,6 +7,7 @@
 ## support method
 
 - ERC721A safeTransferFrom
+- ERC721A BalanceOf
 
 ## CSV Structure