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-rw-r--r--contrib/pg_upgrade/check.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/contrib/pg_upgrade/check.c b/contrib/pg_upgrade/check.c
index 173b29a2c5f..d1dc5dbeaac 100644
--- a/contrib/pg_upgrade/check.c
+++ b/contrib/pg_upgrade/check.c
@@ -372,7 +372,9 @@ check_new_cluster_is_empty(void)
* the new cluster has a 'postgres' database, the number of databases
* will not match. We actually could upgrade such a setup, but it would
* violate the 1-to-1 mapping of database counts, so we throw an error
- * instead.
+ * instead. We would detect this as a database count mismatch during
+ * upgrade, but we want to detect it during the check phase and report
+ * the database name.
*/
static void
check_old_cluster_has_new_cluster_dbs(void)