diff --git a/docs/i18n.txt b/docs/i18n.txt
index d7f5db6861451..7c220c22afe17 100644
--- a/docs/i18n.txt
+++ b/docs/i18n.txt
@@ -282,6 +282,16 @@ How to create language files
 Once you've tagged your strings for later translation, you need to write (or
 obtain) the language translations themselves. Here's how that works.
 
+.. admonition:: Locale restrictions
+
+    Django does support localising your application into a locale for which
+    Django itself has not been translated -- it will ignore your translation
+    files. If you were to try this and Django supported it, you would
+    inevitably see a mixture of translated strings (from your application) and
+    English strings (from Django itself). If you are wanting to support a
+    locale for your application that is not already part of Django, you will
+    need to make at least a minimal translation of the Django core.
+
 Message files
 -------------