diff --git a/DDSim/Helper/Physics.py b/DDSim/Helper/Physics.py
index b1072fa4b6a1cc7d1c16454571fc382ff5e89bba..a31c283c2075f806d6eb8bc80a881b4c0b71e978 100644
--- a/DDSim/Helper/Physics.py
+++ b/DDSim/Helper/Physics.py
@@ -41,6 +41,8 @@ class Physics( ConfigHelper ):
   @property
   def pdgfile( self ):
     """ location of particle.tbl file containing extra particles and their lifetime information
+
+    For example in $DD4HEP/examples/DDG4/examples/particle.tbl
     """
     return self._pdgfile
   @pdgfile.setter