diff --git a/6.sql b/6.sql
index ee8c6ef..1e62ab7 100644
--- a/6.sql
+++ b/6.sql
@@ -1,7 +1,7 @@
 -- write a SQL query to find the names of schools (public or charter!) that reported a 100% graduation rate.
 SELECT "name"
 FROM "schools"
-WHERE "id" = (
+WHERE "id" IN (
     SELECT "school_id"
     FROM "graduation_rates"
     WHERE "graduated" = 100