diff --git a/locale/fr/LC_MESSAGES/base.po b/locale/fr/LC_MESSAGES/base.po
index 0724c67..ce47813 100644
--- a/locale/fr/LC_MESSAGES/base.po
+++ b/locale/fr/LC_MESSAGES/base.po
@@ -23,8 +23,8 @@ msgstr "Un script en ligne de commande pour gérer votre poids."
 msgid "optional : file data"
 msgstr "fichier de données : optionnel"
 
-msgid "optional : weight"
-msgstr "poids : optionnel"
+msgid "optional : weight in kilogram"
+msgstr "poids : optionnel en kilogramme"
 
 msgid "optional : type"
 msgstr "type : optionnel"
@@ -79,3 +79,6 @@ msgstr "-votre commentaire : {comment}"
 
 msgid "-other : {other}"
 msgstr "-autre : {other}"
+
+msgid "optional : size in meter"
+msgstr "taille en mètre : optionnelle"
diff --git a/personal.txt b/personal.txt
new file mode 100644
index 0000000..7c483e8
--- /dev/null
+++ b/personal.txt
@@ -0,0 +1 @@
+1.7
\ No newline at end of file
diff --git a/weight-cli.py b/weight-cli.py
index 20e163e..a002323 100644
--- a/weight-cli.py
+++ b/weight-cli.py
@@ -40,7 +40,16 @@ _ = en.gettext # english
 # Voir : https://medium.com/i18n-and-l10n-resources-for-developers/how-to-translate-python-applications-with-the-gnu-gettext-module-5c1c085041
 
 """
-A measurement is characterized by :
+This program allow you to store and visualise your weight.
+No database is necessary because all is stored in files.
+Three files are important :
+- weight-cli.py, the principal program
+- data2.csv, the data file and
+- Fonctionnel.txt, the code for Gnuplot
+But other files are present, as personal.txt with your other
+parameters.
+
+A measure is characterized by :
     - its value
     - its type
     - its date
@@ -48,6 +57,12 @@ A measurement is characterized by :
     - its identifier
     - one comment
     - other
+    
+Actually, weight-cli allow to add or remove a measure,
+visualise all the measure, plot a graph of these.
+
+To know witch parameters are available, type :
+weight-cli --help or weight-cli -h
 """
 
 def save_file_data():
@@ -66,7 +81,6 @@ def save_file_data():
 	f.write(contents)
 	f.close()
 			
-
 def save_mesure():
 	""" Displaying and recording a measure """
 	print(_("Your measure has been recorded"))
@@ -182,13 +196,34 @@ def plot_graph():
 	process = Popen(['gnuplot', 'Fonctionnel.txt'])#, stdout=PIPE, stderr=PIPE)
 	stdout, stderr = process.communicate()
 	#print(stdout)
-	
+
+def save_size():
+	""" Store the size """
+	f = open('personal.txt', "w")
+	f.write(str(args.size))
+	f.close()
 	
 def tests_subproc():
 	""" Test of the subprocess module """
 	process = Popen(['cat', 'data2.csv'], stdout=PIPE, stderr=PIPE)
 	stdout, stderr = process.communicate()
 	print(stdout)
+	
+def bmi(the_weight):
+	""" Return the BMI for a given weight """
+	f = open('personal.txt', "r")
+	the_size = float(f.read())
+	f.close()
+	bmi = the_weight / pow(the_size, 2)
+	return(bmi)
+	
+def bmi_weight_max():
+	""" Return the weight for BMI max """
+	f = open('personal.txt', "r")
+	the_size = float(f.read())
+	f.close()
+	weight_max = 29.9 * pow(the_size, 2)
+	return(weight_max)
 
 ### Main ###
 """ Weight Recording Program
@@ -205,10 +240,15 @@ parser.add_argument('-da', '--data',
     default='data2.csv',
     help=_('optional : file data')
 )
+parser.add_argument('-s', '--size',
+    type=float,
+    default=-1,
+    help=_('optional : size in meter')
+)
 parser.add_argument('-w', '--weight',
     type=float,
     default=-1,
-    help=_('optional : weight')
+    help=_('optional : weight in kilogram')
 )
 parser.add_argument('-t', '--type',
     default='WEIGHT',
@@ -268,6 +308,8 @@ args = parser.parse_args()
 # Launching of actions
 if args.data != 'data2.csv':
 	save_file_data()
+if args.size != -1:
+	save_size()
 if args.weight != -1:
 	save_mesure()
 if args.read: