diff --git a/0037_how_to_enable_data_checksums_without_downtime.md b/0037_how_to_enable_data_checksums_without_downtime.md
index 6d41246..fc96fe1 100644
--- a/0037_how_to_enable_data_checksums_without_downtime.md
+++ b/0037_how_to_enable_data_checksums_without_downtime.md
@@ -152,7 +152,7 @@ switchover. The steps are straightforward:
    zero downtime, if `pgBouncer` is used, it is recommended to use its `PAUSE/RESUME` capabilities).
 6) Apply the steps 1-3 to the ex-primary (not a replica).
 
-Using this approach, a very large clusters can be successfully converted. Before executing this procedure, additional
+Using this approach, a very large cluster can be successfully converted. Before executing this procedure, additional
 measures are recommended:
 
 - Test `pg_checksums --enable` on a clone / in a lower environment first, and estimate two values for production: