diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 0293dbe51..c2fb4fead 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -75,6 +75,7 @@ The following files need to be changed:
 * src-ui/angular.json (under the _projects/paperless-ui/i18n/locales_ JSON key)
 * src/paperless/settings.py (in the _LANGUAGES_ array)
 * src-ui/src/app/services/settings.service.ts (inside the _getLanguageOptions_ method)
+* src-ui/src/app/app.module.ts (import locale from _angular/common/locales_ and call _registerLocaleData_)
 
 Please add the language in the correct order, alphabetically by locale.
 Note that _en-us_ needs to stay on top of the list, as it is the default project language