diff --git a/config.yml.sample b/config.yml.sample
index 2529042775a..3a56d948b69 100644
--- a/config.yml.sample
+++ b/config.yml.sample
@@ -342,7 +342,7 @@ defaultsettings:
   default_project_id: 0
   # Start of the week for the user. `0` is sunday, `1` is monday and so on.
   week_start: 0
-  # The language of the user interface. Must be an ISO 639-1 language code. Will default to the browser language the user uses when signing up.
+  # The language of the user interface. Must be an ISO 639-1 language code followed by an ISO 3166-1 alpha-2 country code. Check https://kolaente.dev/vikunja/frontend/src/branch/main/src/i18n/lang for a list of possible languages. Will default to the browser language the user uses when signing up.
   language: <unset>
   # The time zone of each individual user. This will affect when users get reminders and overdue task emails.
   timezone: <time zone set at service.timezone>
diff --git a/docs/content/doc/setup/config.md b/docs/content/doc/setup/config.md
index e25f3112634..ba4002a971d 100644
--- a/docs/content/doc/setup/config.md
+++ b/docs/content/doc/setup/config.md
@@ -1307,7 +1307,7 @@ Environment path: `VIKUNJA_DEFAULTSETTINGS_WEEK_START`
 
 ### language
 
-The language of the user interface. Must be an ISO 639-1 language code. Will default to the browser language the user uses when signing up.
+The language of the user interface. Must be an ISO 639-1 language code followed by an ISO 3166-1 alpha-2 country code. Check https://kolaente.dev/vikunja/frontend/src/branch/main/src/i18n/lang for a list of possible languages. Will default to the browser language the user uses when signing up.
 
 Default: `<unset>`