diff --git a/lib/qcd/modules/ObservableModules.h b/lib/qcd/modules/ObservableModules.h
index 579fc1ec..24511617 100644
--- a/lib/qcd/modules/ObservableModules.h
+++ b/lib/qcd/modules/ObservableModules.h
@@ -84,8 +84,6 @@ class PlaquetteMod: public ObservableModule<PlaquetteLogger<Impl>, NoParameters>
   typedef ObservableModule<PlaquetteLogger<Impl>, NoParameters> ObsBase;
   using ObsBase::ObsBase; // for constructors
 
-
-
   // acquire resource
   virtual void initialize(){
     this->ObservablePtr.reset(new PlaquetteLogger<Impl>());
@@ -94,23 +92,22 @@ class PlaquetteMod: public ObservableModule<PlaquetteLogger<Impl>, NoParameters>
   PlaquetteMod(): ObsBase(NoParameters()){}
 };
 
+
 template < class Impl >
-class TopologicalChargeMod: public ObservableModule<TopologicalCharge<Impl>, NoParameters>{
-  typedef ObservableModule<TopologicalCharge<Impl>, NoParameters> ObsBase;
+class TopologicalChargeMod: public ObservableModule<TopologicalCharge<Impl>, TopologyObsParameters>{
+  typedef ObservableModule<TopologicalCharge<Impl>, TopologyObsParameters> ObsBase;
   using ObsBase::ObsBase; // for constructors
 
-
-
   // acquire resource
   virtual void initialize(){
-    this->ObservablePtr.reset(new TopologicalCharge<Impl>());
+    this->ObservablePtr.reset(new TopologicalCharge<Impl>(this->Par_));
   }
   public:
-  TopologicalChargeMod(): ObsBase(NoParameters()){}
+  TopologicalChargeMod(TopologyObsParameters Par): ObsBase(Par){}
+  TopologicalChargeMod(): ObsBase(){}
 };
 
 
-
 }// QCD temporarily here
 
 
diff --git a/lib/qcd/observables/topological_charge.h b/lib/qcd/observables/topological_charge.h
index 5d09c420..c2c419fb 100644
--- a/lib/qcd/observables/topological_charge.h
+++ b/lib/qcd/observables/topological_charge.h
@@ -33,9 +33,45 @@ directory
 namespace Grid {
 namespace QCD {
 
+struct TopologySmearingParameters : Serializable {
+    GRID_SERIALIZABLE_CLASS_MEMBERS(TopologySmearingParameters,
+    int, steps,
+    float, step_size,
+    int, meas_interval,
+    float, maxTau);
+
+    TopologySmearingParameters(int s = 0, float ss = 0.0f, int mi = 0, float mT = 0.0f):
+        steps(s), step_size(ss), meas_interval(mi), maxTau(mT){}
+
+    template < class ReaderClass >
+    TopologySmearingParameters(Reader<ReaderClass>& Reader){
+        read(Reader, "Smearing", *this);  
+    }  
+};
+
+
+
+struct TopologyObsParameters : Serializable {
+    GRID_SERIALIZABLE_CLASS_MEMBERS(TopologyObsParameters,
+      int, interval,
+      bool, do_smearing,
+      TopologySmearingParameters, Smearing);  
+
+    TopologyObsParameters(int interval = 1, bool smearing = false):
+        interval(interval), Smearing(smearing){}
+
+    template <class ReaderClass >
+      TopologyObsParameters(Reader<ReaderClass>& Reader){
+        read(Reader, "TopologyMeasurement", *this);
+  }
+};
+
+
 // this is only defined for a gauge theory
 template <class Impl>
 class TopologicalCharge : public HmcObservable<typename Impl::Field> {
+    TopologyObsParameters Pars;
+
  public:
     // here forces the Impl to be of gauge fields
     // if not the compiler will complain
@@ -44,20 +80,40 @@ class TopologicalCharge : public HmcObservable<typename Impl::Field> {
     // necessary for HmcObservable compatibility
     typedef typename Impl::Field Field;
 
+    TopologicalCharge(int interval = 1, bool do_smearing = false):
+        Pars(interval, do_smearing){}
+    
+    TopologicalCharge(TopologyObsParameters P):Pars(P){
+        std::cout << GridLogDebug << "Creating TopologicalCharge " << std::endl;
+    }
+
     void TrajectoryComplete(int traj,
                             Field &U,
                             GridSerialRNG &sRNG,
                             GridParallelRNG &pRNG) {
 
-    Real q = WilsonLoops<Impl>::TopologicalCharge(U);
+    if (traj%Pars.interval == 0){
+        // Smearing
+        Field Usmear = U;
+        int def_prec = std::cout.precision();
+        
+        if (Pars.do_smearing){
+            // using wilson flow by default here
+            std::cout << "1. " << Pars.Smearing.step_size << std::endl;
+            WilsonFlow<PeriodicGimplR> WF(Pars.Smearing.steps, Pars.Smearing.step_size, Pars.Smearing.meas_interval);
+            WF.smear_adaptive(Usmear, U, Pars.Smearing.maxTau);
+            Real T0   = WF.energyDensityPlaquette(Usmear);
+            std::cout << GridLogMessage << std::setprecision(std::numeric_limits<Real>::digits10 + 1)
+                      << "T0                : [ " << traj << " ] "<< T0 << std::endl;
+        }
 
-    int def_prec = std::cout.precision();
+        Real q    = WilsonLoops<Impl>::TopologicalCharge(Usmear);
+        std::cout << GridLogMessage
+            << std::setprecision(std::numeric_limits<Real>::digits10 + 1)
+            << "Topological Charge: [ " << traj << " ] "<< q << std::endl;
 
-    std::cout << GridLogMessage
-        << std::setprecision(std::numeric_limits<Real>::digits10 + 1)
-        << "Topological Charge: [ " << traj << " ] "<< q << std::endl;
-
-    std::cout.precision(def_prec);
+        std::cout.precision(def_prec);
+        }
     }
 
 };
diff --git a/tests/hmc/Test_hmc_WilsonGauge.cc b/tests/hmc/Test_hmc_WilsonGauge.cc
index b2d5fb02..4cf6d923 100644
--- a/tests/hmc/Test_hmc_WilsonGauge.cc
+++ b/tests/hmc/Test_hmc_WilsonGauge.cc
@@ -66,7 +66,10 @@ int main(int argc, char **argv) {
   typedef PlaquetteMod<HMCWrapper::ImplPolicy> PlaqObs;
   typedef TopologicalChargeMod<HMCWrapper::ImplPolicy> QObs;
   TheHMC.Resources.AddObservable<PlaqObs>();
-  TheHMC.Resources.AddObservable<QObs>();
+  TopologyObsParameters TopParams;
+  TopParams.interval = 1;
+  TopParams.do_smearing = false; 
+  TheHMC.Resources.AddObservable<QObs>(TopParams);
   //////////////////////////////////////////////
 
   /////////////////////////////////////////////////////////////