1 files changed, 8 insertions, 0 deletions
diff --git a/src/js/extract_genome.js b/src/js/extract_genome.js
index 5cb2b38..89bebe3 100644
--- a/src/js/extract_genome.js
+++ b/src/js/extract_genome.js
@@ -1,5 +1,13 @@
 const fs = require('fs');
 const path = require('path');
+if (process.argv.length > 2) {
+    if (process.argv.length === 3 && ['--help', '-h'].includes(process.argv[2])) {
+        console.log('usage: node src/js/extract_genome.js [--help|-h]\nconverts src/core/genome.h and memmap.h into the javascript genome and layout files.');
+        process.exit(0);
+    }
+    console.error('extract_genome: unexpected arguments; use --help for usage');
+    process.exit(2);
+}
 
 const srcPath = path.join(__dirname, '..', 'core', 'genome.h');
 const outPath = path.join(__dirname, 'genome.json');