diff --git a/scripts/make-search-index.js b/scripts/make-search-index.js
index 70df953..38ed214 100644
--- a/scripts/make-search-index.js
+++ b/scripts/make-search-index.js
@@ -34,7 +34,7 @@ lunr = require("lunr")
 fs = require("fs")
 
 if(process.argv.length !== 5) {
-  console.error('Needs exactly 3 arguments (input json, output index).');
+  console.error('Needs exactly 3 arguments (input json, output index, output metadata).');
   process.exit(1);
 }