Update docs/hub/spaces-sdks-static.md

Co-authored-by: Victor Muštar <[email protected]>

Author: coyotte508

docs/hub/spaces-sdks-static.md

@@ -10,6 +10,8 @@ Here are some examples of Spaces using custom HTML:
 
 ## Adding a build step before serving
 
+Static Spaces support adding a custom build step before serving your static assets. This is useful for frameworks like Next.js, SvelteKit, and others that require a build process before serving. The build command runs automatically when your Space is updated.
+
 Add `app_build_command` inside the `YAML` block at the top of your Spaces **README.md** file, and `app_file`.
 
 For example: