diff --git a/README.md b/README.md
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--- a/README.md
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@@ -1,3 +1,10 @@
 # tiptiltgcs
 
-control panel for GCS tiptilt tango device
\ No newline at end of file
+control panel for GCS tiptilt tango device
+
+## usage
+
+bin/tiptiltgcs-gui tango://srv-tango-mag-01:20000/mag/piezo/tiptilt_mag.02 XY : start panel with X Y channels tab selected
+
+
+bin/tiptiltgcs-gui tango://srv-tango-mag-01:20000/mag/piezo/tiptilt_mag.02 FN  : start panel with F N channels tab selected