diff --git a/lib/airtable.js b/lib/airtable.js
index acf3583f..57286653 100644
--- a/lib/airtable.js
+++ b/lib/airtable.js
@@ -38,7 +38,7 @@ var Airtable = Class.extend({
         this.requestTimeout = opts.requestTimeout || defaultConfig.requestTimeout;
 
         if (!this._apiKey) {
-            throw new Error('API is required to connect to Airtable');
+            throw new Error('An API key is required to connect to Airtable');
         }
     },