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-rw-r--r--src/include/access/tableam.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/access/tableam.h b/src/include/access/tableam.h
index 7465f037860..f1e6f554aa7 100644
--- a/src/include/access/tableam.h
+++ b/src/include/access/tableam.h
@@ -113,7 +113,8 @@ typedef enum TM_Result
*
* xmax is the outdating transaction's XID. If the caller wants to visit the
* replacement tuple, it must check that this matches before believing the
- * replacement is really a match.
+ * replacement is really a match. This is InvalidTransactionId if the target
+ * was !LP_NORMAL (expected only for a TID retrieved from syscache).
*
* cmax is the outdating command's CID, but only when the failure code is
* TM_SelfModified (i.e., something in the current transaction outdated the