diff --git a/README.md b/README.md
index 424bd2a..0fd7773 100644
--- a/README.md
+++ b/README.md
@@ -19,16 +19,22 @@ Move the `flashairup` directory to the desired place (e.g. `/home/<USER>/`), ref
 
 Install the required python packages:
 ```
-  #In the WORKDIR
+  cd WORKDIR
   pip install -r requirements.txt
 ```
 
 ### Systemd setup
 
-Change the WORKDIR the `flashairup.systemd` file and 
-move the altered file with the `flashairup.timer` file  to `/etc/systemd/system/`.
+Change in the WORKDIR the `flashairup.systemd` file and 
+move the file to `/etc/systemd/system/`.
+Move the `flashairup.timer` file to the same location.
 The files can be found in the `scripts` directory.
 
+After move the files to the correct directories, enable the timer with the following statement:
+```
+sudo systemctl enable --now flashairup.timer
+```
+
 ### Configuration and Directory hierarchy
 
 
@@ -47,6 +53,7 @@ Create the following directory structure inside the WORKDIR:
 ```
 where `cam1` is only an example for the name of a cam.
 The `last.txt` is needed for keeping track of the index of the last synchronised pictures.
+If the card gets formatted, the counter in this file needs to be reset as well.
 The `flashairup.conf` should at least contain the `DEFAULT` section:
 
 ```
@@ -76,6 +83,7 @@ Example config:
    ftp_path = media/pictures
    ftp_user = ftpuser
    ftp_pwd = strongpassword1
+   # Decide if the pictures are going to be uploaded in the new db or in the old db
    db = new
    # Set the logger level (DEBUG, INFO, WARNING, ERROR)
    log_level = DEBUG
@@ -84,3 +92,32 @@ Example config:
    ip = 10.0.0.10
    location = DCIM/101NIKON
 ```
+
+
+
+## Troubleshooting
+
+### FlashAir SD-Card is not connecting to the WLAN
+
+First, there may be a configuration error, check the [FlashAir Configuration](#flashair-configuration) for a correct configuration
+
+Second, the Access Point might run on a channel which is not reachable by the FlashAir card.
+Ensure that the configured channel is between 1 and 10.
+
+
+## Knowledge Base
+
+The configuration on the Flashair cards was taken from [here](https://mattshub.com/blog/2017/04/11/flashair-sd-card)
+
+### Short concept of the python program
+
+Since the Flashair cards create a small webserver on which the pictures are served, one is able to get them via curl.
+The python program therefore uses curl to download the pictures.
+With another curl command it is possible to get a list of files on the cam.
+The program gets this list and compare the number of the last image with the number on the corresponding `last.txt`. 
+If the number is higher on the Flashair card, the picture gets processed.
+By processing, it is meant that the curl command for downloading a file is issued, then the file gets uploaded via FTP
+to the remote server and finally the counter in `last.txt` gets updated. 
+This is important, because if there were some mistakes in the processing, the counter will stay the same and therefore,
+the picture is downloaded again in the next run.
+The job of each python function and object is documented inside the code