diff --git a/Generators/PowhegControl/python/parameters/registry.py b/Generators/PowhegControl/python/parameters/registry.py
index 82590545f5c72f47eb9ca78de6f2a22a4576fadf..0b0e937ea611fdf2688f226f735ae675f011b09d 100644
--- a/Generators/PowhegControl/python/parameters/registry.py
+++ b/Generators/PowhegControl/python/parameters/registry.py
@@ -133,6 +133,8 @@ class Registry(object):
         self.add_default("dronly", 0, description="include only double resonant diagrams. [1:enabled]")
         self.add_default("dummyvirtual", 1, description="run with dummy virtual. [1:enabled]")
         self.add_default("dynamic_hdamp", 0, description="if 1, use hdamp = HT/2 (overwrites hdamp), if 0 use fixed hdamp")
+        self.add_default("dynhdamp", 0, description="ttbb: if 1, use hdamp = HT/2 (overwrites hdamp), if 0 use fixed hdamp")
+        self.add_default("dynhdampPF", -1, description="ttbb: prefactor for dynamic hdamp")
         self.add_default("e+e-", 0, hidden=True, description="WWj decay mode [1:enabled]")
         self.add_default("e+mu-", 0, hidden=True, description="WWj decay mode [1:enabled]")
         self.add_default("ebeam1", 6500, name="beam_energy", frozen=True, description="energy of beam in GeV")
diff --git a/Generators/PowhegControl/python/processes/powheg/ttbb.py b/Generators/PowhegControl/python/processes/powheg/ttbb.py
index 2b9c1308c2e49612550fe19cc10bedb0352d31c1..883895c584234a342823c6faf1b6f89754e9ab8f 100644
--- a/Generators/PowhegControl/python/processes/powheg/ttbb.py
+++ b/Generators/PowhegControl/python/processes/powheg/ttbb.py
@@ -129,6 +129,10 @@ class ttbb(PowhegRES):
         self.add_keyword("withdamp", 1)
         self.add_keyword("xgriditeration")
         self.add_keyword("xupbound", 2)
+        self.add_keyword("hdamp", -1)
+        self.add_keyword("dynhdamp", 1)
+        self.add_keyword("dynhdampPF", 0.5)
+
 
     def validate_decays(self):
         """