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-rw-r--r--src/include/utils/memutils.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/include/utils/memutils.h b/src/include/utils/memutils.h
index 5ee533b30d7..7c1202478e5 100644
--- a/src/include/utils/memutils.h
+++ b/src/include/utils/memutils.h
@@ -30,7 +30,9 @@
* be summarily denied.
*
* XXX This is deliberately chosen to correspond to the limiting size
- * of varlena objects under TOAST. See VARATT_MASK_SIZE in postgres.h.
+ * of varlena objects under TOAST. See VARSIZE_4B() and related macros
+ * in postgres.h. Many datatypes assume that any allocatable size can
+ * be represented in a varlena header.
*
* XXX Also, various places in aset.c assume they can compute twice an
* allocation's size without overflow, so beware of raising this.