diff --git a/src/content/docs/drizzle-config-file.mdx b/src/content/docs/drizzle-config-file.mdx
index 579a2459..824a1d1f 100644
--- a/src/content/docs/drizzle-config-file.mdx
+++ b/src/content/docs/drizzle-config-file.mdx
@@ -183,6 +183,22 @@ export default defineConfig({
 <rem025/>
 <SchemaFilePaths />
 
+### `casing`
+<rem025/>
+`casing` is responsible for in-code column keys casing for migration commands.
+|               |                      |
+| :------------ | :-----------------   |
+| type          | `'camelCase' \| 'snake_case'` |
+| default        | --                    |
+| commands      | `migrate` `push` `pull` `generate`   |
+<rem025/>
+```ts {4}
+import { defineConfig } from "drizzle-kit";
+export default defineConfig({
+  dialect: "postgresql",
+  casing: "snake_case", 
+});
+```
 
 ### `out`
 <rem025/>
diff --git a/src/content/docs/sql-schema-declaration.mdx b/src/content/docs/sql-schema-declaration.mdx
index 0e3ad0ea..7eea046a 100644
--- a/src/content/docs/sql-schema-declaration.mdx
+++ b/src/content/docs/sql-schema-declaration.mdx
@@ -251,6 +251,11 @@ SELECT "id", "first_name" from users;
 ```
 </Section>
 
+**Note:** The `casing` option configured in the Drizzle ORM instance only affects runtime query mapping.  
+It does not apply to `drizzle-kit` (migrations, schema generation, etc.), which uses its own configuration in `drizzle.config.ts`.  
+
+See the [`casing`](/docs/drizzle-config-file#casing) option in the drizzle config reference for more information.
+
 ### Advanced
 
 There are a few tricks you can use with Drizzle ORM. As long as Drizzle is entirely in TypeScript files,