TestSpecs/gen: add usage comment for rgen script

diff --git a/TestSpecs/gen/rgen b/TestSpecs/gen/rgen
index 4f4adfb..bb86cb4 100755 (executable)
--- a/TestSpecs/gen/rgen
+++ b/TestSpecs/gen/rgen
@@ -4,6 +4,9 @@
 # Generate R script for plot processing from campaign and scenario
 # configuration file
 #
+# Sample run:
+#   ./rgen ../test-campaign.cfg ../test-scenario-pre-post-nop-ul.cfg > out.R
+#
 
 if test $# -ne 2; then
        echo "Usage: $0 campaign-config-file scenario-config-file" 1>&2