diff --git a/docs/migration-guide/to-15.md b/docs/migration-guide/to-15.md
index d913f6083d..dfdfdd7948 100644
--- a/docs/migration-guide/to-15.md
+++ b/docs/migration-guide/to-15.md
@@ -8,7 +8,7 @@ If you would like to keep the previous behavior, you should change your config t
 
 ```diff json
 {
-- "extends": ["config-a"]
+- "extends": ["config-a"],
   "overrides": [
     {
       "rules": ["*.module.css"],