diff --git a/book/routing.rst b/book/routing.rst
index c67f93031a6..5be5911137e 100644
--- a/book/routing.rst
+++ b/book/routing.rst
@@ -417,6 +417,12 @@ match, giving the ``page`` parameter a value of ``2``. Perfect.
 | /blog/2 | {page} = 2 |
 +---------+------------+
 
+.. tip::
+
+    Routes with optional parameters at the end will not match on requests 
+    with a trailing slash (i.e. ``/blog/``). In this case the slash is a separator and
+    should not be used if the optional parameter isn't passed.
+
 .. index::
    single: Routing; Requirements