diff --git a/docs/index.rst b/docs/index.rst
index d096f57..3eb038c 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -13,4 +13,9 @@ Overview
 .. toctree::
    :maxdepth: 3
 
+   overview
+   installation
+   telecommands_decoding
+   logfile
    packaging
+   implementation
diff --git a/docs/logfile.rst b/docs/logfile.rst
new file mode 100644
index 0000000..0911ac0
--- /dev/null
+++ b/docs/logfile.rst
@@ -0,0 +1,15 @@
+**************
+Logging System  
+**************
+
+The Logging System of the Spacelab Decoder shows the events performed in the software - such as when a telecommand was decoded - and their respective date and time. 
+
+
+Operation
+#########
+
+The logfile is automatically generated inside a default folder in the user home page in the archives called "spacelab_decoder", but in the preferences of the software the user can choose in which folder to save the file.
+
+The generated archive is a .csv file displaying date and time on one column and the event on the other one. The event can be a successfull decoding, an error or even the software startup. 
+
+
diff --git a/docs/overview.rst b/docs/overview.rst
new file mode 100644
index 0000000..763b19c
--- /dev/null
+++ b/docs/overview.rst
@@ -0,0 +1,38 @@
+########
+Overview 
+########
+
+The *Spacelab Decoder* is a Python in-development software to decode satellites telemetry from recorded audio file and subsequently real time decoding.
+
+A list of known satellites that are planned to use this software so far are presented below:
+
+* **FloripaSat-1** [1]_
+* **GOLDS-UFSC (a.k.a. FloripaSat-2)** [2]_
+* **Catarina-A1**
+
+The satellites of the list above are developed (or in development) by the same research group: the *Space Technology Research Laboratory* (SpaceLab) [3]_, from *Universidade Federal de Santa Catarina* (Brazil).
+
+The Software
+============
+
+.. image:: img/main-window.png
+   :width: 700
+
+The objective of this software is to become the "universal" software of the Spacelab's Satellites to decode the data from any of its satellites.
+
+The main ways to achieve that are 
+
+- to use a recorded audio file in the Wave format;
+- and real time decoding using the an interface called Gqrx.
+
+This application is written in Python, and is based on the experience gathered in the applications developed for the FloripaSat-1 mission. For telemetry encoding and transmission, there is also another application developed by the same research group, called *SpaceLab Transmitter* [4]_. The software also countains a logging system to register the events happening in the application.
+
+More details of the software are described in the next sections of this documentation.
+
+References
+==========
+
+.. [1] Marcelino, Gabriel M.; Martinez, Sara V.; Seman, Laio O., Slongo, Leonardo K.; Bezerra, Eduardo A. *A Critical Embedded System Challenge: The FloripaSat-1 Mission*. IEEE Latin America Transactions, Vol. 18, Issue 2, 2020.
+.. [2] https://github.com/spacelab-ufsc/floripasat2-doc
+.. [3] https://spacelab.ufsc.br/
+.. [4] https://github.com/spacelab-ufsc/spacelab-transmitter
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diff --git a/docs/telecommands_decoding.rst b/docs/telecommands_decoding.rst
new file mode 100644
index 0000000..2850cc3
--- /dev/null
+++ b/docs/telecommands_decoding.rst
@@ -0,0 +1 @@
+explain the wav and gqrx
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