diff --git a/batch/batch.go b/batch/batch.go
index <HASH>..<HASH> 100644
--- a/batch/batch.go
+++ b/batch/batch.go
@@ -1,4 +1,5 @@
-// Package batch lets you buffer bulk documents for insert.
+// Package batch lets you buffer bulk documents for insert. None of the methods
+// provided are thread-safe, you must synchronize if desired.
 package batch
 
 import (
add thread-safety docs

annoying when you have to dig around to find out