diff --git a/Tracking/beam.py b/Tracking/beam.py
index 9fde0f48a823688e8d71b0b2155f05eb94984269..1ffede319f0000feed6230ae57b5680897252b16 100644
--- a/Tracking/beam.py
+++ b/Tracking/beam.py
@@ -23,6 +23,7 @@ class Bunch:
         Bunch current in [A]
     alive : bool, optional
         If False, the bunch is defined as empty 
+        
     Attributes
     ----------
     mp_number : int
@@ -249,7 +250,10 @@ class Beam:
         
     Methods
     ------
-    init_beam()
+    init_beam(filling_pattern, current_per_bunch=1e-3, mp_per_bunch=1e3)
+        Initialize beam with a given filling pattern and marco-particle number 
+        per bunch. Then initialize the different bunches with a 6D gaussian
+        phase space.
     """
     
     def __init__(self, ring, bunch_list=None):