diff --git a/docs/index.rst b/docs/index.rst
index c973950615..42be69ee0c 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -5,7 +5,6 @@ ESP32 Programming Guide
 
    Until ESP-IDF release 1.0, this documentation is a draft. It is incomplete and may have mistakes. Please mind your step!
 
-
 Contents:
 
 .. toctree::
@@ -16,8 +15,6 @@ Contents:
    Linux <linux-setup>
    Mac OS <macos-setup>
 
-.. Configure - TBA
-
 .. Connect - TBA
 
 .. toctree::
@@ -35,16 +32,74 @@ Contents:
    build_system
    openocd
 
+.. API Reference
+   ..
+   Table of Contents Outline
+   ..
+   1. System - TBA
+     1.1. Fundamentals of multiprocessor programming with FreeRTOS - TBA
+     1.2. Application startup flow - TBA
+     1.3. Flash encryption and secure boot: how they work and APIs - TBA
+     1.4. Lower Power Coprocessor - TBA
+     1.5. Watchdogs
+     1.6. ...
+   2. Memeory - TBA
+     2.1. Memory layout of the application (IRAM/IROM, limitations of each) - TBA
+     2.2. Flash layout and partitions - TBA
+     2.3. Flash access APIs - TBA
+     2.4. Partition APIs - TBA
+     2.5. OTA mechanism (app partitions, OTA partition) and APIs - TBA
+     2.6. ... 
+   3. Wi-Fi
+   4. Bluetooth
+     4.1. BT Classic - TBA
+     4.2. BLE
+   5. Ethernet - TBA
+   6. Interfaces
+     6.1. GPIO
+     6.2. ADC - TBA
+     6.3. DAC - TBA
+     6.4. UART - TBA
+     6.5. I2C - TBA
+     6.6. I2S - TBA
+     6.7. SPI - TBA
+     6.8. CAN - TBA
+     6.9. SD Controller - TBA
+     6.10. Infrared - TBA
+     6.11. Pulse Counter - TBA
+     6.12. PWM - TBA
+     6.13. LED PWM
+     6.14. ...
+   7. Sensors - TBA
+     7.1. Hall Sensor - TBA
+     7.2. Temperature Sensor - TBA
+     7.3. Touch Sensor - TBA
+   8. Protocols - TBA
+   9. Components
+     9.1. Logging <api/log>
+     9.2  Non-Volatile Storage <api/nvs_flash>
+     9.3  Virtual Filesystem <api/vfs>
+     9.3. Http sever - TBA
+   10. Applications - TBA
+   ..
+   API Dcoumentation Teamplate
+   ..
+
 .. toctree::
    :caption: API Reference
    :maxdepth: 1
 
    Wi-Fi <api/esp_wifi>
    Bluetooth <api/bt>
+
    GPIO <api/gpio>
+   LED Control <api/ledc>
+
    Logging <api/log>
-   Non-volatile storage <api/nvs>
-   Virtual filesystem <api/vfs>
+   Non-Volatile Storage <api/nvs_flash>
+   Virtual Filesystem <api/vfs>
+   deep-sleep-stub
+
    Template <api/template>
 
 .. toctree::
@@ -76,3 +131,4 @@ Indices
 
 * :ref:`genindex`
 * :ref:`search`
+