diff --git a/circuitpython/code/main.py b/circuitpython/code/main.py
index 0f61e0a..b08dd47 100644
--- a/circuitpython/code/main.py
+++ b/circuitpython/code/main.py
@@ -115,9 +115,10 @@ class Data:
                 if not self.data[source] == None:
                     for d in self.data[source].items():
                         print("\t{0}: {1}".format(d[0], d[1]))
+
     @property
     def json(self):
-        """Serialize data to json-formatted string"""
+        """Serialized data to json-formatted string"""
         output = '{'
         first_source = True
         for source in self.data.keys():
@@ -143,7 +144,8 @@ class Data:
 
     @property
     def rgb(self):
-        """Convert atmospheric data from BME280 sensor into NeoPixel color
+        """Convert atmospheric data from BME280 sensor into NeoPixel color as
+        a tuple (RED, BLUE, GREEN):
          * RED => temperature : max = 35degC, min =10degC (range 25°C)
          * BLUE => humidity : max= 100%, mini=0%
          * GREEN => pression : mini=960hPa, maxi = 1030hPa (range 70hPa)
@@ -196,7 +198,11 @@ def check_data_dir():
     elif 'daily' not in os.listdir('data'):
         os.mkdir('data/daily')
 
-def set_clock_from_GPS():
+def set_clock_from_GPS(treshold=5.0):
+    """Compare internal RTC and date-time from GPS (if enable and fixed) and set
+    the RTC date time to GPS date-time if the difference is more or equal to
+    threshold (in seconds)"""
+
     if gps_enable and gps.has_fix:
         #Congreen GPS timestamp into struct_time
         gps_datetime =  time.struct_time((gps.timestamp_utc.tm_year,
@@ -206,7 +212,7 @@ def set_clock_from_GPS():
                                           gps.timestamp_utc.tm_min,
                                           gps.timestamp_utc.tm_sec, 0, 0, 0))
         #Max difference between GPS and internal RTC (in seconds):
-        if abs(time.mktime(gps_datetime) - time.mktime(clock.datetime)) >= 5.0:
+        if abs(time.mktime(gps_datetime) - time.mktime(clock.datetime)) >= treshold:
             print("Clock difference with GPS!")
             print("Previous date/time : " + datetime_format.format(*clock.datetime[0:6]))
             clock.datetime = gps_datetime   #Trust GPS if there is a bias