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-rw-r--r--src/include/storage/proc.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/include/storage/proc.h b/src/include/storage/proc.h
index 2579e619ebc..91824b46918 100644
--- a/src/include/storage/proc.h
+++ b/src/include/storage/proc.h
@@ -32,6 +32,8 @@
* If none of the caches have overflowed, we can assume that an XID that's not
* listed anywhere in the PGPROC array is not a running transaction. Else we
* have to look at pg_subtrans.
+ *
+ * See src/test/isolation/specs/subxid-overflow.spec if you change this.
*/
#define PGPROC_MAX_CACHED_SUBXIDS 64 /* XXX guessed-at value */