diff --git a/tmp-builder-codes-outline.mdx b/tmp-builder-codes-outline.mdx
index 60a9c818c..069cea611 100644
--- a/tmp-builder-codes-outline.mdx
+++ b/tmp-builder-codes-outline.mdx
@@ -16,13 +16,13 @@ You do **not** build, validate, or encode anything — you just use the suffix w
 
 If your app sends a normal `eth_sendTransaction`:
 
-`tx.data = tx.data + dataSuffix;`
+`tx.data = tx.data + dataSuffix.slice(2);`
 
 ### **B. Smart Account / ERC-4337 UserOps**
 
 If your app constructs User Operations:
 
-`userOp.callData = userOp.callData + dataSuffix;`
+`userOp.callData = userOp.callData + dataSuffix.slice(2);`
 
 Smart accounts require putting the suffix inside the `callData` of the userOp.