diff --git a/aiogram/client/telegram.py b/aiogram/client/telegram.py
index dfededb8..b8e89a89 100644
--- a/aiogram/client/telegram.py
+++ b/aiogram/client/telegram.py
@@ -33,6 +33,13 @@ class TelegramAPIServer:
 
     @classmethod
     def from_base(cls, base: str, is_local: bool = False) -> "TelegramAPIServer":
+        """
+        Use this method to auto-generate TelegramAPIServer instance from base URL
+
+        :param base: Base URL
+        :param is_local: Mark this server is in `local mode <https://core.telegram.org/bots/api#using-a-local-bot-api-server>`_.
+        :return: instance of :class:`TelegramAPIServer`
+        """
         base = base.rstrip("/")
         return cls(
             base=f"{base}/bot{{token}}/{{method}}",
diff --git a/docs2/api/session/aiohttp.rst b/docs2/api/session/aiohttp.rst
index 54b4d72d..3a595d1b 100644
--- a/docs2/api/session/aiohttp.rst
+++ b/docs2/api/session/aiohttp.rst
@@ -6,6 +6,8 @@ AiohttpSession represents a wrapper-class around `ClientSession` from `aiohttp <
 
 Currently `AiohttpSession` is a default session used in `aiogram.Bot`
 
+.. autoclass:: aiogram.client.session.aiohttp.AiohttpSession
+
 Usage example
 =============
 
diff --git a/docs2/api/session/custom_server.rst b/docs2/api/session/custom_server.rst
new file mode 100644
index 00000000..fe2b86f4
--- /dev/null
+++ b/docs2/api/session/custom_server.rst
@@ -0,0 +1,13 @@
+Use Custom API server
+=====================
+
+.. autoclass:: aiogram.client.telegram.TelegramAPIServer
+    :members:
+
+For example, if you want to use self-hosted API server:
+
+.. code-block:: python3
+
+    session = AiohttpSession()
+    session.api = TelegramAPIServer.from_base('http://localhost:8082')
+    bot = Bot(..., session=session)
diff --git a/docs2/api/session/index.rst b/docs2/api/session/index.rst
index c9ff9cd6..dff24e7a 100644
--- a/docs2/api/session/index.rst
+++ b/docs2/api/session/index.rst
@@ -2,6 +2,9 @@
 Client session
 ##############
 
+Client sessions is used for interacting with API server.
+
 .. toctree::
+    custom_server
     base
     aiohttp