diff --git a/lutin.py b/lutin.py
index 88881f7..c15d98c 100755
--- a/lutin.py
+++ b/lutin.py
@@ -126,11 +126,15 @@ def Start():
 				#remove previous target
 				target = None
 		else:
-			#load the target if needed :
-			if target == None:
-				target = lutinTarget.TargetLoad(targetName, compilator, mode, generatePackage)
-			target.Build(argument.GetOptionName())
-			actionDone=True
+			if argument.GetOptionName() != "":
+				debug.warning("Can not understand argument : '" + argument.GetOptionName() + "'")
+				usage()
+			else:
+				#load the target if needed :
+				if target == None:
+					target = lutinTarget.TargetLoad(targetName, compilator, mode, generatePackage)
+				target.Build(argument.GetArg())
+				actionDone=True
 	# if no action done : we do "all" ...
 	if actionDone==False:
 		#load the target if needed :
diff --git a/lutinArg.py b/lutinArg.py
index 9df4e97..b1bbb60 100644
--- a/lutinArg.py
+++ b/lutinArg.py
@@ -15,9 +15,11 @@ class argElement:
 	
 	def Display(self):
 		if len(self.m_arg)==0:
-			debug.info("element : " + self.m_option)
+			debug.info("option : " + self.m_option)
+		elif len(self.m_option)==0:
+			debug.info("element :       " + self.m_arg)
 		else:
-			debug.info("element : " + self.m_option + ":" + self.m_arg)
+			debug.info("option : " + self.m_option + ":" + self.m_arg)
 
 
 class argDefine:
@@ -229,7 +231,7 @@ class lutinArg:
 			if argumentFound==False:
 				#unknow element ... ==> just add in the list ...
 				debug.verbose("unknow argument : " + argument)
-				listArgument.append(argElement(argument, ""))
+				listArgument.append(argElement("", argument))
 			
 		#for argument in listArgument:
 		#	argument.Display()