diff --git a/README.md b/README.md
index ffd81e3..971e199 100644
--- a/README.md
+++ b/README.md
@@ -3,14 +3,17 @@
 This package is supposed to be used to detect the sources in NuStar observations and generate a mask excluding the signal from the sources of any kind. 
 
 Additionaly, it generates a table containing:
+
 Useful data about the observation:
+
 1. OBS_ID
 2. Detector
-3. coordinates in equatorial (ra,dec) and galactical (lon,lat) systems
-4. time of the observation in seconds
-5. exposure
+3. Coordinates in equatorial (ra,dec) and galactical (lon,lat) systems
+4. Time of the observation in seconds
+5. Exposure
 
 Useful algorythm-related data:
+
 6. average count rate on unmasked area
 7. portion of unmasked area
 8. specific statistical metric[1] before and after masking the detected sources
@@ -29,4 +32,12 @@ To use the package in your project, import it in by writing
 
 `from nuwavsource import nuwavsource`
 
-The list of useful tools in this package is
+You can process the cl.evt file by creating an Observation class object:
+
+`obs = nuwavsource.Observation(path_to_evt_file)`
+
+Additionally, the energy band to get events from can be passed as an argument:
+
+`obs = nuwavsource.Observation(path_to_evt_file,E_borders=[E_min,E_max])`
+
+The default value used in the code is [3,20]