diff --git a/src/backend/access/transam/README b/src/backend/access/transam/README
index 734c39a4d0a..72af6560600 100644
--- a/src/backend/access/transam/README
+++ b/src/backend/access/transam/README
@@ -198,7 +198,7 @@ parent.  This maintains the invariant that child transactions have XIDs later
 than their parents, which is assumed in a number of places.
 
 The subsidiary actions of obtaining a lock on the XID and entering it into
-pg_subtrans and PG_PROC are done at the time it is assigned.
+pg_subtrans and PGPROC are done at the time it is assigned.
 
 A transaction that has no XID still needs to be identified for various
 purposes, notably holding locks.  For this purpose we assign a "virtual
diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 50f092d7eb3..7abc6a07056 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -680,12 +680,12 @@ AssignTransactionId(TransactionState s)
 		log_unknown_top = true;
 
 	/*
-	 * Generate a new FullTransactionId and record its xid in PG_PROC and
+	 * Generate a new FullTransactionId and record its xid in PGPROC and
 	 * pg_subtrans.
 	 *
 	 * NB: we must make the subtrans entry BEFORE the Xid appears anywhere in
-	 * shared storage other than PG_PROC; because if there's no room for it in
-	 * PG_PROC, the subtrans entry is needed to ensure that other backends see
+	 * shared storage other than PGPROC; because if there's no room for it in
+	 * PGPROC, the subtrans entry is needed to ensure that other backends see
 	 * the Xid as "running".  See GetNewTransactionId.
 	 */
 	s->fullTransactionId = GetNewTransactionId(isSubXact);