diff --git a/docs/reference/config.md b/docs/reference/config.md
index 7914b45eab..9baa4c7801 100644
--- a/docs/reference/config.md
+++ b/docs/reference/config.md
@@ -241,7 +241,7 @@ overrides:
     overrides:
       - db_type: "timestampz"
         nullable: true
-        engine: ""postgresql
+        engine: "postgresql"
         go_type:
           import: "gopkg.in/guregu/null.v4"
           package: "null"