diff --git a/chart_config.py b/chart_config.py
index c6487a4..a71568a 100644
--- a/chart_config.py
+++ b/chart_config.py
@@ -1,11 +1,32 @@
 from configparser import ConfigParser
 class ChartConfig:
+    """
+    Class that holds the chart section of a configuration file (for an instrument).
+    
+    Attributes :
+        chart_config (Section) : the Section corresponding to the "chart" section in the given configuration file
+    """
     def __init__(self, path):
+        """
+        Parameters :
+            path (str) : the path to the configuration file
+        """
         cfgp = ConfigParser(interpolation=None)
         cfgp.read(path)
         self.chart_config = cfgp["chart"]
 
     def get_variable_parameter_config(self, key):
+        """
+        Gets the configuration of the given key in the configuration file (chart section).
+
+        Parameters :
+            key (str) : the key to look for in the chart section (<variable>[.<param>])
+
+        Returns :
+            {"cat":(str), "color":(str), "unit":(str)} | None : a dictionnary representing the different options for the given key in the chart section.
+                The different options are in this dict if they are found in the chart section for the given key. Returns None if the key is not in the chart section,
+                or if there is a syntax problem for the given key.
+        """
         config = {}
         positionnal = ["cat", "color", "unit"]
         if key in self.chart_config.keys():