diff --git a/precompiles/xcm/XCM_v2.sol b/precompiles/xcm/XCM_v2.sol
index f9afcfdc2a..fe5d61091d 100644
--- a/precompiles/xcm/XCM_v2.sol
+++ b/precompiles/xcm/XCM_v2.sol
@@ -35,7 +35,9 @@ interface XCM {
     /// @param currencyAddress The ERC20 address of the currency we want to transfer
     /// @param amount The amount of tokens we want to transfer
     /// @param destination The Multilocation to which we want to send the tokens
-    /// @param weight The weight we want to buy in the destination chain 
+    /// @param weight The weight we want to buy in the destination chain, to provide
+    /// unlimited weight, you should use maximum u64 value (i.e. 18446744073709551615 )
+    /// for ref_time
     function transfer(
         address currencyAddress,
         uint256 amount,
@@ -49,7 +51,9 @@ interface XCM {
     /// @param currencyAddress The ERC20 address of the currency we want to transfer
     /// @param amount The amount of tokens we want to transfer
     /// @param destination The Multilocation to which we want to send the tokens
-    /// @param weight The weight we want to buy in the destination chain 
+    /// @param weight The weight we want to buy in the destination chain, to provide
+    /// unlimited weight, you should use maximum u64 value (i.e. 18446744073709551615 )
+    /// for ref_time
     function transfer_with_fee(
         address currencyAddress,
         uint256 amount,
@@ -65,7 +69,9 @@ interface XCM {
     /// Currently only Concrete Fungible assets
     /// @param amount The amount of tokens we want to transfer
     /// @param destination The Multilocation to which we want to send the tokens
-    /// @param weight The weight we want to buy in the destination chain 
+    /// @param weight The weight we want to buy in the destination chain, to provide
+    /// unlimited weight, you should use maximum u64 value (i.e. 18446744073709551615 )
+    /// for ref_time
     function transfer_multiasset(
         Multilocation memory asset,
         uint256 amount,
@@ -80,7 +86,9 @@ interface XCM {
     /// Currently only Concrete Fungible assets
     /// @param amount The amount of tokens we want to transfer
     /// @param destination The Multilocation to which we want to send the tokens
-    /// @param weight The weight we want to buy in the destination chain 
+    /// @param weight The weight we want to buy in the destination chain, to provide
+    /// unlimited weight, you should use maximum u64 value (i.e. 18446744073709551615 )
+    /// for ref_time
     function transfer_multiasset_with_fee(
         Multilocation memory asset,
         uint256 amount,
@@ -95,7 +103,9 @@ interface XCM {
     /// @param currencies The currencies we want to transfer, defined by their address and amount.
     /// @param feeItem Which of the currencies to be used as fee
     /// @param destination The Multilocation to which we want to send the tokens
-    /// @param weight The weight we want to buy in the destination chain 
+    /// @param weight The weight we want to buy in the destination chain, to provide
+    /// unlimited weight, you should use maximum u64 value (i.e. 18446744073709551615 )
+    /// for ref_time
     function transfer_multi_currencies(
         Currency[] memory currencies,
         uint32 feeItem,
@@ -109,7 +119,9 @@ interface XCM {
     /// @param assets The assets we want to transfer, defined by their location and amount.
     /// @param feeItem Which of the currencies to be used as fee
     /// @param destination The Multilocation to which we want to send the tokens
-    /// @param weight The weight we want to buy in the destination chain 
+    /// @param weight The weight we want to buy in the destination chain, to provide
+    /// unlimited weight, you should use maximum u64 value (i.e. 18446744073709551615 )
+    /// for ref_time
     function transfer_multi_assets(
         EvmMultiAsset[] memory assets,
         uint32 feeItem,