diff --git a/src/backend/storage/page/README b/src/backend/storage/page/README
index 5127d98da3..4e45bd92ab 100644
--- a/src/backend/storage/page/README
+++ b/src/backend/storage/page/README
@@ -9,7 +9,8 @@ have a very low measured incidence according to research on large server farms,
 http://www.cs.toronto.edu/~bianca/papers/sigmetrics09.pdf, discussed
 2010/12/22 on -hackers list.
 
-Current implementation requires this be enabled system-wide at initdb time.
+Current implementation requires this be enabled system-wide at initdb time, or
+by using the pg_checksums tool on an offline cluster.
 
 The checksum is not valid at all times on a data page!!
 The checksum is valid when the page leaves the shared pool and is checked