diff --git a/docs/user/advanced.rst b/docs/user/advanced.rst
index 055c88a9..543b3785 100644
--- a/docs/user/advanced.rst
+++ b/docs/user/advanced.rst
@@ -994,6 +994,10 @@ The mount call registers a specific instance of a Transport Adapter to a
 prefix. Once mounted, any HTTP request made using that session whose URL starts
 with the given prefix will use the given Transport Adapter.
 
+.. note:: The adapter will be chosen based on a longest prefix match. Be mindful
+   prefixes such as ``http://localhost`` will also match ``http://localhost.other.com``
+   or ``http://localhost@other.com``. It's recommended to terminate full hostnames with a ``/``.
+
 Many of the details of implementing a Transport Adapter are beyond the scope of
 this documentation, but take a look at the next example for a simple SSL use-
 case. For more than that, you might look at subclassing the