diff --git a/apps/docs/content/guides/api/rest/generating-types.mdx b/apps/docs/content/guides/api/rest/generating-types.mdx
index 624749a1d17..45d9c77ce18 100644
--- a/apps/docs/content/guides/api/rest/generating-types.mdx
+++ b/apps/docs/content/guides/api/rest/generating-types.mdx
@@ -125,6 +125,12 @@ export type Database = MergeDeep<
 >
 ```
 
+<Admonition type="note">
+
+To use `MergeDeep`, set `compilerOptions.strictNullChecks` to `true` in your `tsconfig.json`.
+
+</Admonition>
+
 You can also override the type of an individual successful response if needed:
 
 ```ts