diff --git a/src/pyuwds3/types/scene_node.py b/src/pyuwds3/types/scene_node.py
index 54a3562..ef99bb4 100644
--- a/src/pyuwds3/types/scene_node.py
+++ b/src/pyuwds3/types/scene_node.py
@@ -50,7 +50,8 @@ def __init__(self,
                  p_cov_h=0.85, m_cov_h=1e-9,
                  p_cov_p=0.8, m_cov_p=0.01,
                  p_cov_r=0.06, m_cov_r=0.001,
-                 time=None):
+                 time=None,
+                 agent=False):
         """ Scene node constructor
         """
         self.id = str(uuid.uuid4()).replace("-", "")
@@ -60,6 +61,8 @@ def __init__(self,
         self.bbox = None
         self.mask = None
 
+        self.agent=agent
+
         self.n_init = n_init
         self.max_lost = max_lost
         self.max_age = max_age