diff --git a/geant4/LEMuSR/src/LEMuSRPgaMessenger.cc b/geant4/LEMuSR/src/LEMuSRPgaMessenger.cc
index 20c3bb4..fc9cc37 100644
--- a/geant4/LEMuSR/src/LEMuSRPgaMessenger.cc
+++ b/geant4/LEMuSR/src/LEMuSRPgaMessenger.cc
@@ -55,10 +55,10 @@ LEMuSRPgaMessenger::LEMuSRPgaMessenger(LEMuSRPrimaryGeneratorAction *thePGA)
   posCmd->SetParameterName("X [cm]","Y [cm]","Z [cm]",true,true); 
   posCmd->SetDefaultValue(Hep3Vector(0., 0., -114));
 
-  posCmd = new G4UIcmdWith3Vector("/lemuGun/MomentumDirection",this);
-  posCmd->SetGuidance("Set momentum direction >> sum must equal one.");
-  posCmd->SetParameterName("momX ","momY ","momZ ",true,true); 
-  posCmd->SetDefaultValue(Hep3Vector(0., 0., 1.));
+  momCmd = new G4UIcmdWith3Vector("/lemuGun/MomentumDirection",this);
+  momCmd->SetGuidance("Set momentum direction >> norm must be one.");
+  momCmd->SetParameterName("momX ","momY ","momZ ",true,true); 
+  momCmd->SetDefaultValue(Hep3Vector(0., 0., 1.));
 
 
   scaCmd = new G4UIcmdWith3Vector("/lemuGun/scan/square",this);