diff --git a/docs/settings.txt b/docs/settings.txt
index 792c59b3c4..fb2e04f1ea 100644
--- a/docs/settings.txt
+++ b/docs/settings.txt
@@ -185,8 +185,11 @@ ADMIN_MEDIA_PREFIX
 
 Default: ``'/media/'``
 
-The URL prefix for admin media -- CSS, JavaScript and images. Make sure to use
-a trailing slash.
+The URL prefix for admin media -- CSS, JavaScript and images used by
+the Django administrative interface. Make sure to use a trailing
+slash, and to have this be different from the ``MEDIA_URL`` setting
+(since the same URL cannot be mapped onto two different sets of
+files).
 
 ADMINS
 ------