diff --git a/bip-0054.md b/bip-0054.md
index 826f39f91f..349305feb5 100644
--- a/bip-0054.md
+++ b/bip-0054.md
@@ -76,8 +76,7 @@ separately:
 
 Transactions whose witness-stripped serialized size is exactly 64 bytes are invalid.
 
-The coinbase transaction's `nLockTime` field must be set to the height of the block minus 1[^2]
-and its `nSequence` field must not be equal to 0xffffffff.
+When the block height is greater than 0, the coinbase transaction's `nLockTime` field must be set to the height of the block minus 1[^2] and its `nSequence` field must not be equal to 0xffffffff.
 
 ## Rationale