diff --git a/sorter.py b/sorter.py
index 3a0654004609eada06c21dfedf329fe61128a4db..9ed631201d53ab9f877e095ac8be81668c8cfcca 100644
--- a/sorter.py
+++ b/sorter.py
@@ -74,6 +74,7 @@ def insert_transcoded_video(jobid, jobtype, data, state, status):
 	insert_video(data['lecture_id'], data['output']['path'], data['format_id'], status['hash'], status['filesize'], status['duration'], data['source_id'] )
 
 def parseVideoFileName(splitFileName):
+	# filenames: <handle>-<sorter>-<format>.mp4
 	data = {'keywords': []}
 	for fileNameChunk in splitFileName:
 		fileNameChunk = fileNameChunk.replace('.mp4','')
@@ -95,7 +96,6 @@ def parseVideoFileName(splitFileName):
 
 def matchDatetimeOnLecture(lectures, date, time):
 	matches = []
-	# first try date and time (if one of them is set)
 	if date or time:
 		print(1)
 		for lecture in lectures:
@@ -129,8 +129,6 @@ def matchFileNameOnFormat(splitFileName):
 	return 0
 
 def sort_file(filename, course=None, lectures=None):
-	# filenames: <handle>-<sorter>-<format>.mp4
-	# "sorter" musst be found with fuzzy matching. "sorter" musst be one or more of the following types: (inside the loop)
 	# '_' and ' ' are handled like '-'
 	splitFileName = filename.replace('_','-').replace(' ','-').split('-')
 	if not course:
@@ -143,16 +141,18 @@ def sort_file(filename, course=None, lectures=None):
 		course = courses[0]
 	if not lectures:
 		lectures = query('SELECT * from lectures where course_id = ?', course['id'])
+	# parse all data from the file name
 	data = parseVideoFileName(splitFileName)
 	# try to match the file on a single lecture
 	matches = matchDatetimeOnLecture(lectures, data.get('date'), data.get('time'))
 	# if we can't match exactly  based on date and time, we have to match keywords
 	if ((len(matches) != 1) and (len(data['keywords']) > 0)):
-		#only test lectures with the correct date/time, if we have any. Else test for matches in all lectures of this course
-		if len(matches) == 0:
-			matches = matchKeywordsOnLecture(lectures, data['keywords'])
-		else:
+		if not len(matches) == 0:
+			# only test lectures with the correct date/time, if we have any
 			matches = matchKeywordsOnLecture(matches, data['keywords'])
+		else:
+			# Else test for matches in all lectures of this course
+			matches = matchKeywordsOnLecture(lectures, data['keywords'])
 	# now we should have found exactly one match
 	fmt = matchFileNameOnFormat(splitFileName)
 	return matches, fmt