diff --git a/lib/historical.js b/lib/historical.js
index c3952c2..63951fa 100644
--- a/lib/historical.js
+++ b/lib/historical.js
@@ -71,6 +71,16 @@ function _sanitizeHistoricalOptions(options) {
     }
   }
 
+  if (_.isString(options.events)) {
+    if (!_.includes(['split', 'div', 'capital', 'history'], options.events)) {
+      throw new Error('"options.events" must be "split", "div", "capital", or "history".');
+    }
+  } else {
+    if (!_.isUndefined(options.events) && !_.isNull(options.events)) {
+      throw new Error('"options.events" must be a string or undefined/null.');
+    }
+  }
+
   if (!options.from) {
     options.from = moment('1900-01-01');
   }
@@ -83,7 +93,9 @@ function _sanitizeHistoricalOptions(options) {
     options.period = '1d';
   }
 
-  options.events = 'history';
+  if (!options.events) {
+    options.events = 'history';
+  }
 
   // Convert to yahoo v7 API
   switch (options.period) {