diff --git a/protocol/protocol.tex b/protocol/protocol.tex
index bad70b79e..316e8a257 100644
--- a/protocol/protocol.tex
+++ b/protocol/protocol.tex
@@ -12345,12 +12345,12 @@
         $\vBalance{Sapling}$,}\nufive{ minus $\vBalance{Orchard}$,} \MUSTNOT be greater than the value in
         \zatoshi of \minerSubsidy plus the \transactionFees paid by \transactions in this \block.
 \notheartwood{
-  \item A \coinbaseTransaction \MUSTNOT have any
+  \item A \coinbaseTransaction \MUSTNOT have any \transparentInputs,
         \joinSplitDescriptions\sapling{, \spendDescriptions, or \outputDescriptions}.
 }
 \notbeforeheartwood{
-  \item A \coinbaseTransaction \MUSTNOT have any
-        \joinSplitDescriptions\sapling{ or \spendDescriptions}.
+  \item A \coinbaseTransaction \MUSTNOT have any \transparentInputs,
+        \joinSplitDescriptions\sapling{, or \spendDescriptions}.
   \preheartwooditem{\sapling{A \coinbaseTransaction also \MUSTNOT have any \outputDescriptions.}}
 }
   \nufiveonwarditem{In a version 5 \coinbaseTransaction, the \enableSpendsOrchard{} flag \MUST be $0$.}
@@ -14220,6 +14220,13 @@
 \lsection{Change History}{changehistory}
 
 
+\historyentry{2021.1.24}{2021-04-23}
+\begin{itemize}
+    \item Explicitly say that \coinbaseTransactions \MUSTNOT have \transparentInputs
+          (this is a consensus rule inherited from \Bitcoin which has been present since launch).
+\end{itemize}
+
+
 \historyentry{2021.1.23}{2021-04-19}
 \begin{itemize}
 \nufive{