Index: /branches/eam_branches/ipp-dev-20210817/Ohana/src/opihi/cmd.data/tdhistogram.c
===================================================================
--- /branches/eam_branches/ipp-dev-20210817/Ohana/src/opihi/cmd.data/tdhistogram.c	(revision 41817)
+++ /branches/eam_branches/ipp-dev-20210817/Ohana/src/opihi/cmd.data/tdhistogram.c	(revision 41818)
@@ -45,6 +45,8 @@
   int valid = (!reuse && (argc == 11)) || (reuse && (argc == 5));
   if (!valid) {
-    gprint (GP_ERR, "USAGE: tdhistogram buffer x y z (Xmin) (Xmax) (Ymin) (Ymax) (Zmin) (Zmax) [-dx dx] [-dy dy] [-dz dz]\n");
+    gprint (GP_ERR, "USAGE: tdhistogram buffer x y z (Xmin) (Xmax) (Ymin) (Ymax) (Zmin) (Zmax) [-dx dx] [-dy dy] [-dz dz] [-range range]\n");
     gprint (GP_ERR, "   OR: tdhistogram buffer x y z -reuse\n");
+    gprint (GP_ERR, "   -dx, -dy, -dy specify the bin size in these directions\n");
+    gprint (GP_ERR, "   -range : generate an output vector corresponding to the elements in the z-direction\n");
     gprint (GP_ERR, " output buffer is 3D\n");
     return (FALSE);