diff --git a/fourmi.py b/fourmi.py
index efa4e54..c09087d 100755
--- a/fourmi.py
+++ b/fourmi.py
@@ -34,6 +34,13 @@ from sourceloader import SourceLoader
 
 
 def setup_crawler(searchable, settings, source_loader, attributes):
+    """
+    This function prepares and start the crawler which starts the actual search on the internet
+    :param searchable: The compound which should be searched
+    :param settings: A scrapy settings object
+    :param source_loader: A fully functional SourceLoader object which contains only the sources that should be used.
+    :param attributes: A list of regular expressions which the attribute names should match.
+    """
     spider = FourmiSpider(compound=searchable, selected_attributes=attributes)
     spider.add_parsers(source_loader.sources)
     crawler = Crawler(settings)
@@ -44,8 +51,13 @@ def setup_crawler(searchable, settings, source_loader, attributes):
 
 
 def scrapy_settings_manipulation(docopt_arguments):
+    """
+    This function manipulates the Scrapy settings that normally would be set in the settings file. In the Fourmi
+    project these are command line arguments.
+    :param docopt_arguments: A dictionary generated by docopt containing all CLI arguments.
+    """
     settings = get_project_settings()
-    # [todo] - add at least a warning for files that already exist
+
     if docopt_arguments["--output"] != 'result.*format*':
         settings.overrides["FEED_URI"] = docopt_arguments["--output"]
     elif docopt_arguments["--format"] == "jsonlines":
@@ -60,6 +72,10 @@ def scrapy_settings_manipulation(docopt_arguments):
 
 
 def start_log(docopt_arguments):
+    """
+    This function starts the logging functionality of Scrapy using the settings given by the CLI.
+    :param docopt_arguments:  A dictionary generated by docopt containing all CLI arguments.
+    """
     if docopt_arguments["--log"] is not None:
         if docopt_arguments["--verbose"]:
             log.start(logfile=docopt_arguments["--log"], logstdout=False, loglevel=log.DEBUG)
@@ -73,12 +89,18 @@ def start_log(docopt_arguments):
 
 
 def search(docopt_arguments, source_loader):
+    """
+    The function that facilitates the search for a specific compound.
+    :param docopt_arguments: A dictionary generated by docopt containing all CLI arguments.
+    :param source_loader: An initiated SourceLoader object pointed at the directory with the sources.
+    """
     start_log(docopt_arguments)
     settings = scrapy_settings_manipulation(docopt_arguments)
     setup_crawler(docopt_arguments["<compound>"], settings, source_loader, docopt_arguments["--attributes"].split(','))
     reactor.run()
 
 
+# The start for the Fourmi Command Line interface.
 if __name__ == '__main__':
     arguments = docopt.docopt(__doc__, version='Fourmi - V0.3.0')
     loader = SourceLoader()