diff --git a/sample_files/ISO_nut.xcsg b/sample_files/ISO_nut.xcsg
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diff --git a/sample_files/README.md b/sample_files/README.md
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+# xcsg sample files
+
+This folder contains sample input files for the xcsg program. To convert to STL, do:
+
+ $ xcsg --stl .xcsg
+
+* [ISO_nut](ISO_nut.xcsg) : An M16 nut with internal threads
\ No newline at end of file