diff --git a/ch06_transactions.adoc b/ch06_transactions.adoc
index 1be2629c..01e28f81 100644
--- a/ch06_transactions.adoc
+++ b/ch06_transactions.adoc
@@ -406,7 +406,7 @@ and using scripts in detail in <<c_authorization_authentication>>.
 [[sequence]]
 ==== Sequence
 
-The final four bytes of an input are its _sequence_ number.
+The ((("transactions", "inputs", "sequence field", id="transaction-input-sequence")))((("inputs", "sequence field", id="input-transaction-sequence")))((("sequence field (transaction inputs)", id="sequence-field")))final four bytes of an input are its _sequence_ number.
 The use and meaning of this field has changed over time.
 
 [[original_tx_replacement]]
@@ -574,7 +574,7 @@ as defined by BIP68.
 image::images/mbc3_0603.png["BIP68 definition of sequence encoding"]
 
 Note that any transaction which sets a relative timelock using sequence
-also sends the signal for opt-in replace by fee ((("transactions", "inputs", startref="transaction-input")))((("inputs", startref="input-transaction")))as described in
+also sends the signal for opt-in replace by fee ((("transactions", "inputs", startref="transaction-input")))((("inputs", startref="input-transaction")))((("transactions", "inputs", "sequence field", startref="transaction-input-sequence")))((("inputs", "sequence field", startref="input-transaction-sequence")))((("sequence field (transaction inputs)", startref="sequence-field")))as described in
 <<sequence-bip125>>.
 
 === Outputs