Fix grammar

Reported by Jeremy Finzel

diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index e3941c9391b7fe4f277e673e7a2f31ba7a168714..a421dc2fbac05ff71bc8ff6cc6cb3432fee2eb50 100644 (file)
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -558,7 +558,7 @@
    removes the rest. The estimate is based on a moving average of the number
    of WAL files used in previous checkpoint cycles. The moving average
    is increased immediately if the actual usage exceeds the estimate, so it
-   accommodates peak usage rather average usage to some extent.
+   accommodates peak usage rather than average usage to some extent.
    min_wal_size puts a minimum on the amount of WAL files
    recycled for future usage; that much WAL is always recycled for future use,
    even if the system is idle and the WAL usage estimate suggests that little