diff --git a/README.md b/README.md
index 135f4c3..7c852ff 100644
--- a/README.md
+++ b/README.md
@@ -31,17 +31,17 @@ operations on DARC. For example:
 
 ```javascript
 mint_tokens(   // mint token operation
-    [[addr1, addr2, addr3],   // token address
+    [addr1, addr2, addr3],   // token address
     [0, 0, 0],   // token class 
-    [500, 300, 200]]  // number of tokens
+    [500, 300, 200]  // number of tokens
 );
 
 pay_cash(100000000, 0, 1); // pay 0.1 ETH as purchase
 
 transfer_tokens(   // transfer token operation
-    [[addr1, addr2, addr3],   // token address
+    [addr1, addr2, addr3],   // token address
     [0, 0, 0],   // token class 
-    [100, 100, 200]]  // number of tokens
+    [100, 100, 200]  // number of tokens
 );
 
 add_withdraw_cash(10000000);  // add 0.01 ETH to withdraw balance