diff --git a/builder/amazonebs/builder.go b/builder/amazonebs/builder.go
index 330589c7d..c89d906a8 100644
--- a/builder/amazonebs/builder.go
+++ b/builder/amazonebs/builder.go
@@ -1,3 +1,8 @@
+// The amazonebs package contains a packer.Builder implementation that
+// builds AMIs for Amazon EC2.
+//
+// In general, there are two types of AMIs that can be created: ebs-backed or
+// instance-store. This builder _only_ builds ebs-backed images.
 package amazonebs
 
 import (