diff --git a/functions.py b/functions.py
index 3b65f81..2050f9a 100644
--- a/functions.py
+++ b/functions.py
@@ -10,7 +10,20 @@ from fractions import Fraction
 import pyexiv2
 
 class Radiation:
-    ''' Handles CSV processing. '''
+    '''
+    Reiceives Values vom CSV file and creates a list of the relevant data
+
+    Arguments:
+    timestamp: Date/time string from CSV as string
+    radiation: Radiation from CSV in CP/M as float
+    local_timezone: timezone for timezone-unware CSV / Photo, if GPX is timezone aware
+    si_factor: CP/M to (µS/h) conversion factor - specific to GMC-tube
+    
+    Returns:
+    timestamp: timestamp of CSV value als datetime object
+    radiation: radiation in µS/h as str (for Exif comment, UTF-8)
+    '''
+
     def __init__(self, timestamp, radiation, local_timezone, si_factor):
         self.timestamp = self._time_conversion(timestamp, local_timezone)
         self.radiation = self._radiation_conversion(radiation, si_factor)
@@ -30,7 +43,20 @@ class Radiation:
         return radiation
 
 class Photo:
-    ''' Reads and writes Exif metadata. '''
+    '''
+    Reads Exif metadata.
+
+    Arguments:
+    photo: source photo ()
+    local_timezone: timezone for timezone-unware CSV / Photo, if GPX is timezone aware
+    dest_dir: destination directory where the photo is going to be copied to.
+    dry_run: whether to acutally write (True / False)
+
+    Returns:
+    self.get_date: timestamp of photo als datetime object
+    self.get_target_photo: full path to photo file to work on
+    '''
+
     def __init__(self, photo, local_timezone, dest_dir, dry_run):
         self.get_date = self._get_creation_date(photo, local_timezone)
         self.get_target_photo = self._copy_photo(photo, dest_dir, dry_run)
@@ -57,7 +83,6 @@ class Photo:
         # Load Exif data from photo
         metadata = pyexiv2.ImageMetadata(photo)
         metadata.read()
-        print(metadata)
         date = metadata['Exif.Photo.DateTimeOriginal']
         # date.value creates datetime object in pic_naive_time
         pic_naive_time = date.value
@@ -66,7 +91,8 @@ class Photo:
         return pic_aware_time
 
 class Exif:
-    ''' Converts, compiles and writes Exif-Tags from given values. 
+    '''
+    Converts, compiles and writes Exif-Tags from given arguemnts. 
     
     Arguments:
     photo: file name of photo to modify
@@ -75,14 +101,18 @@ class Exif:
     longitude: longitude as float
     elevation: elevation as float
     dry_run: whether to acutally write (True / False)
+
+    Returns:
+    Latitude / Longitude in degrees
+    Exif-Comment that has been written (incl. radiation)
     '''
 
     def __init__(self, photo, radiation, latitude, longitude, elevation, dry_run):
-        # self.get_degree = self._to_degree(value, loc)
-        self.write_exif = self._write_exif(photo, radiation, latitude, longitude, elevation, dry_run)
-
-#    def __repr__(self):
-#        return 'Photo: %s Creation Date: %s' % (str(self.get_target_photo), str(self.get_date))
+        self.write_exif = self._write_exif(photo, radiation, latitude,
+                                           longitude, elevation, dry_run)
+ 
+    def __repr__(self):
+        return 'Position: %s, %s: %s ' % self.write_exif
 
     def _to_degree(self, value, loc):
         if value < 0:
@@ -106,9 +136,6 @@ class Exif:
         latitude_degree = self._to_degree(latitude, ["S", "N"])
         longitude_degree = self._to_degree(longitude, ["W", "E"])
 
-        print(latitude_degree)
-        print(longitude_degree)
-        
         # convert decimal coordinates into fractions required for pyexiv2
         exiv2_latitude = (Fraction(latitude_degree[0] * 60 + latitude_degree[1], 60),
                           Fraction(int(round(latitude_degree[2] * 100, 0)), 6000),
@@ -132,10 +159,8 @@ class Exif:
         metadata['Exif.GPSInfo.GPSVersionID'] = '2 0 0 0'
         metadata['Exif.Photo.UserComment'] = new_comment
 
-        print(new_comment)
-
         # Write Exif tags to file, if not in dry-run mode
         if dry_run is not True:
             metadata.write()
 
-        return new_comment
+        return latitude_degree, longitude_degree, new_comment