diff --git a/README.md b/README.md
index 8a62597..d7a3161 100755
--- a/README.md
+++ b/README.md
@@ -590,7 +590,7 @@ db.removeIndex('somefield', function (err) {
 });
 
 // Example of using expireAfterSeconds to remove documents 1 hour
-// after their creation (timestampData option is true here)
+// after their creation (db's timestampData option is true here)
 db.ensureIndex({ fieldName: 'createdAt', expireAfterSeconds: 3600 }, function (err) {
 });
 ```