diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index f8cc136..e9ed92b 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -198,7 +198,7 @@ typedef TransactionStateData *TransactionState;
 
 /*
  * Serialized representation used to transmit transaction state to parallel
- * workers though shared memory.
+ * workers through shared memory.
  */
 typedef struct SerializedTransactionState
 {