diff --git a/docs/README.md b/docs/README.md
index 77621ef..312e1e9 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,3 +1,11 @@
 # LibreTuya documentation
 
-TODO
+- [LibreTuya API](api/README.md)
+- [Built-in libraries](libraries/README.md)
+- [3-rd party libraries](Libraries.md)
+- [Configuration options](API%20Configuration.md)
+
+## Realtek AmebaZ Series
+
+- [Debugging](platform/realtek/Debugging.md)
+- [Exception decoder](platform/realtek/Exception%20decoder.md)
diff --git a/docs/libraries/README.md b/docs/libraries/README.md
new file mode 100644
index 0000000..a8cc7af
--- /dev/null
+++ b/docs/libraries/README.md
@@ -0,0 +1,25 @@
+# Built-in libraries
+(in alphabetical order)
+
+## base64
+- [Source](https://github.com/espressif/arduino-esp32/blob/master/cores/esp32/base64.cpp): ESP32 Arduino Core
+- [API](../../arduino/libretuya/libraries/base64/base64.h)
+
+Helper base64 encoder used in some libs taken from ESP32.
+
+## HTTPClient
+- [Source](https://github.com/espressif/arduino-esp32/tree/master/libraries/HTTPClient): ESP32 Arduino Core
+- [API](../../arduino/libretuya/libraries/HTTPClient/HTTPClient.h)
+- [Examples](https://github.com/espressif/arduino-esp32/tree/master/libraries/HTTPClient/examples)
+
+HTTP(S) client. Some reference may be found here: [https://links2004.github.io/Arduino/dd/d8d/class_h_t_t_p_client.html](https://links2004.github.io/Arduino/dd/d8d/class_h_t_t_p_client.html).
+
+## WiFiMulti
+- [Source](https://github.com/espressif/arduino-esp32/tree/master/libraries/WiFi/src): ESP32 Arduino Core
+- [API](../../arduino/libretuya/libraries/WiFiMulti/WiFiMulti.h)
+- [Docs](https://docs.espressif.com/projects/arduino-esp32/en/latest/api/wifi.html#wifimulti)
+- Examples:
+  - [WiFiMulti](https://github.com/espressif/arduino-esp32/blob/master/libraries/WiFi/examples/WiFiMulti/WiFiMulti.ino)
+  - [WiFiClientBasic](https://github.com/espressif/arduino-esp32/blob/master/libraries/WiFi/examples/WiFiClientBasic/WiFiClientBasic.ino)
+
+Class for selecting best available AP from a list of several ones.