diff --git a/explain-walkthrough.md b/explain-walkthrough.md
index 0102d76b169a6..78895bbb43dd8 100644
--- a/explain-walkthrough.md
+++ b/explain-walkthrough.md
@@ -73,7 +73,7 @@ EXPLAIN ANALYZE SELECT count(*) FROM trips WHERE start_date BETWEEN '2017-07-01
 5 rows in set (1.03 sec)
 ```
 
-The example query above takes `1.03` seconds to execute, which is an ideal performance.
+The example query above takes `1.03` seconds to execute, which is not ideal performance.
 
 From the result of `EXPLAIN ANALYZE` above, `actRows` indicates that some of the estimates (`estRows`) are inaccurate (expecting 10 thousand rows but finding 19 million rows), which is already indicated in the `operator info` (`stats:pseudo`) of `└─TableFullScan_18`. If you run [`ANALYZE TABLE`](/sql-statements/sql-statement-analyze-table.md) first and then `EXPLAIN ANALYZE` again, you can see that the estimates are much closer: