Fixes #426

02_getting_started.asciidoc

@@ -245,6 +245,12 @@ image:images/bitcoin-atm-receive.png[]
 
 Alice will see the transaction from the ATM in the "TRANSACTION HISTORY" tab of the Eclair wallet. While Eclair will detect the bitcoin transaction in just a few seconds, it will take approximately one hour for the bitcoin transaction to be "confirmed" on the Bitcoin blockchain. As you can see in <<eclair-tx1>>, Alice's Eclair wallet shows "6+ conf" below the transaction, indicating that the transaction has received the required minimum of six confirmations, and her funds are now ready to use.
 
+[TIP]
+====
+The number of "confirmations" on a transaction is the number of blocks mined since (and inclusive) the block that contained that transaction. Six confirmation is a best practice, but different Lightning wallets can consider a channel open after any number of confirmations. Some wallets even scale up the number of expected confirmations by the monetary value of the channel.
+====
+
+
 [[eclair-tx1]]
 .Alice receives bitcoin
 image:images/eclair-tx1-btc.png[]