diff --git a/pageserver/src/walreceiver.rs b/pageserver/src/walreceiver.rs
index 420eecaeff..8885446b2e 100644
--- a/pageserver/src/walreceiver.rs
+++ b/pageserver/src/walreceiver.rs
@@ -198,7 +198,7 @@ fn walreceiver_main(
                 // flush ptr.
                 timeline.advance_last_valid_lsn(endlsn);
 
-                // Somewhat arbitrarily, if we have at least one complete wal segment (16 MB each),
+                // Somewhat arbitrarily, if we have at least 10 complete wal segments (16 MB each),
                 // "checkpoint" the repository to flush all the changes from WAL we've processed
                 // so far to disk. After this, we don't need the original WAL anymore, and it
                 // can be removed. This is probably too aggressive for production, but it's useful
diff --git a/vendor/postgres b/vendor/postgres
index 8478beabaf..a08f50cba2 160000
--- a/vendor/postgres
+++ b/vendor/postgres
@@ -1 +1 @@
-Subproject commit 8478beabaf7d6916d22bde99ee5a577a9b6b237c
+Subproject commit a08f50cba293fff045cb771f8c6bb23b89f4f7f7