diff --git a/doc/source/index.rst b/doc/source/index.rst
index 139c21cec..6f5cbe9fa 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -80,6 +80,30 @@ Concepts
 
    glossary
 
+Modules reference
+=================
+
+Zaqar is composed of two layers:
+
+.. toctree::
+   :maxdepth: 1
+
+   transport
+   storage
+
+The **transport drivers** are responsible for interacting with Zaqar clients.
+Every query made by clients is processed by the transport layer,
+which is in charge of passing this information to the backend and then
+returning the response in a format understandable by the client.
+
+The **storage drivers** are responsible for interacting with the storage backends
+and, that way, store or retrieve the data coming from the transport layer.
+
+In order to keep these layers decoupled, we have established that
+**checks should be performed in the appropriate layer**. In other words,
+transport drivers must guarantee that the incoming data is well-formed
+and storage drivers must enforce their data model stays consistent.
+
 Setting up a development environment
 ====================================
 
@@ -125,30 +149,6 @@ API reference
 
    api/autoindex
 
-Modules reference
-=================
-
-Zaqar is composed of two layers:
-
-.. toctree::
-   :maxdepth: 1
-
-   transport
-   storage
-
-The **transport drivers** are responsible for interacting with Zaqar clients.
-Every query made by clients is processed by the transport layer,
-which is in charge of passing this information to the backend and then
-returning the response in a format understandable by the client.
-
-The **storage drivers** are responsible for interacting with the storage backends
-and, that way, store or retrieve the data coming from the transport layer.
-
-In order to keep these layers decoupled, we have established that
-**checks should be performed in the appropriate layer**. In other words,
-transport drivers must guarantee that the incoming data is well-formed
-and storage drivers must enforce their data model stays consistent.
-
 Indices and tables
 ------------------