diff --git a/5_2_Resending_a_Transaction_with_RBF.md b/5_2_Resending_a_Transaction_with_RBF.md
index c860f84..d09cfd2 100644
--- a/5_2_Resending_a_Transaction_with_RBF.md
+++ b/5_2_Resending_a_Transaction_with_RBF.md
@@ -4,7 +4,7 @@
 
 If your Bitcoin transaction is stuck, and you're sender, you can resend it using RBF (replace-by-fee).
 
-> **VERSION WARNING:** This is an innovation from Bitcoin Core v 0.12.0, which means that by now most miners should be using it. However, it only reached full maturity in the Bitcoin core wallet, with the `bumpfee` command in 
+> **VERSION WARNING:** This is an innovation from Bitcoin Core v 0.12.0, which means that by now most miners should be using it. However, it only reached full maturity in the Bitcoin core wallet Bitcoin Core v 0.14.0.
 
 ## Opt-In for RBF
 
@@ -60,6 +60,8 @@ walletrbf=1
 ```
 Once you've done this (and restarted your `bitcoind`), then all transactions should have a lower sequence number and be marked as `bip125-replaceable`.
 
+> **VERSION WARNING:** The Walletrbf flag require Bitcoin Core v.0.14.0.
+
 ## Replace a Transaction the Hard Way: By Hand
 
 ### Use RBF Wisely