diff --git a/apps/docs/pages/guides/database/extensions/pgroonga.mdx b/apps/docs/pages/guides/database/extensions/pgroonga.mdx
index 9ee8f811b52..911bd4f2005 100644
--- a/apps/docs/pages/guides/database/extensions/pgroonga.mdx
+++ b/apps/docs/pages/guides/database/extensions/pgroonga.mdx
@@ -154,7 +154,7 @@ And the result:
 ```
 
 ### Search that matches words with negation
-To find all memos where content contain the word postgres but not pgroonga, use - symbol:
+To find all memos where content contain the word `postgres` but not `pgroonga`, use `-` symbol:
 
 {/* prettier-ignore */}
 ```sql