diff --git a/electrum/transaction.py b/electrum/transaction.py
index 763d003d0..bcf44e8be 100644
--- a/electrum/transaction.py
+++ b/electrum/transaction.py
@@ -254,7 +254,7 @@ class TxInput:
 
     def is_coinbase_output(self) -> bool:
         """Whether the coin being spent is an output of a coinbase tx.
-        This matters for coin maturity.
+        This matters for coin maturity (and pretty much only for that!).
         """
         return self._is_coinbase_output