diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 17eeff0720..1b3a3d9bea 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -809,11 +809,9 @@ static XLogSegNo openLogSegNo = 0;
 
 /*
  * These variables are used similarly to the ones above, but for reading
- * the XLOG.  Note, however, that readOff generally represents the offset
- * of the page just read, not the seek position of the FD itself, which
- * will be just past that page. readLen indicates how much of the current
- * page has been read into readBuf, and readSource indicates where we got
- * the currently open file from.
+ * the XLOG.  readOff is the offset of the page just read, readLen
+ * indicates how much of it has been read into readBuf, and readSource
+ * indicates where we got the currently open file from.
  * Note: we could use Reserve/ReleaseExternalFD to track consumption of
  * this FD too; but it doesn't currently seem worthwhile, since the XLOG is
  * not read by general-purpose sessions.