diff --git a/lib/onboarding.js b/lib/onboarding.js
index 7e0e2c7..53b4fed 100644
--- a/lib/onboarding.js
+++ b/lib/onboarding.js
@@ -159,6 +159,11 @@ async function runOnboarding() {
       ]
     );
 
+    if (authMode === 'apiKeys') {
+      console.log('Warning: when using API keys, the spreadsheet must be publicly accessible.');
+      console.log('');
+    }
+
     const credentialCount = await askPositiveInteger(
       ask,
       `How many ${authMode === 'apiKeys' ? 'API keys' : 'service accounts'} do you want to add? `
diff --git a/package.json b/package.json
index 7587678..9fd54ab 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "google-sheets-rate-assistant",
-  "version": "2.1.3",
+  "version": "2.1.5",
   "description": "Pull Google Sheets data and export to CSV with configurable schedules and rate limiting.",
   "main": "index.js",
   "bin": "index.js",