diff --git a/doc/source/index.rst b/doc/source/index.rst
index a7106b3..5afcecf 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -7,6 +7,15 @@
  Oslo Design Specifications
 ============================
 
+Train
+=====
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   specs/train/*
+
 Stein
 =====
 
diff --git a/specs/train/placeholder.rst b/specs/train/placeholder.rst
new file mode 100644
index 0000000..70f2665
--- /dev/null
+++ b/specs/train/placeholder.rst
@@ -0,0 +1,31 @@
+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+==================
+(Placeholder Spec)
+==================
+
+This file is just a placeholder for the specs directory.
+It will be removed soon after some spec is merged.
+
+The latest spec template is found at ``specs/template.rst``
+in the ``oslo-specs`` repository.
+
+Problem Description
+===================
+
+Sphinx toctree complains if no file exists in a directory
+specified in toctree glob.
+
+Proposed Change
+===============
+
+Add this file.
+
+References
+==========
+
+None.
\ No newline at end of file