diff --git a/routing.rst b/routing.rst
index 3c1c4558e62..80c5beeb91e 100644
--- a/routing.rst
+++ b/routing.rst
@@ -210,6 +210,16 @@ should be used during the request. Defining routes this way also eliminated the
 need for duplicate registration of routes which minimizes the risk for any bugs
 caused by definition inconsistency.
 
+.. tip::
+
+    If the application uses full language + territory locales (e.g. ``fr_FR``,
+    ``fr_BE``), you can use the language part only in your routes (e.g. ``fr``).
+    This prevents having to define multiple paths when you want to use the same
+    route path for locales that share the same language.
+
+.. versionadded:: 4.2
+    The feature to fall back on the language part only was introduced in Symfony 4.2.
+
 A common requirement for internationalized applications is to prefix all routes
 with a locale. This can be done by defining a different prefix for each locale
 (and setting an empty prefix for your default locale if you prefer it):