diff --git a/etrago/tools/utilities.py b/etrago/tools/utilities.py
index 2ae40b4a..9894d377 100755
--- a/etrago/tools/utilities.py
+++ b/etrago/tools/utilities.py
@@ -219,8 +219,9 @@ def buses_by_country(network, con):
 
     Parameters
     ----------
-    self : Etrago object
+    self : :class:'pypsa.components.Network'
         Overall container of PyPSA
+    con : connexion to db
 
     Returns
     -------