command line usage

fsl_regfilt.cc

@@ -36,7 +36,7 @@ using namespace std;
 		string("output file name for the filtered data"),
 		true, requires_argument);
   Option<string> fndesign(string("-d,--design"), string(""),
-		string("file name of the GLM design matrix (time courses)"),
+		string("file name of the matrix with time courses (e.g. GLM design or MELODIC mixing matrix)"),
 		true, requires_argument);
   Option<string> fnmask(string("-m,--mask"), string(""),
 		string("mask image file name"),