diff --git a/js/README.md b/js/README.md
index 2126c394266..d8e598854f9 100644
--- a/js/README.md
+++ b/js/README.md
@@ -38,7 +38,7 @@ Apache Arrow is the emerging standard for large in-memory columnar data ([Spark]
 
 # Usage
 
-## Get a table from an Arrow file on disk
+## Get a table from an Arrow file on disk (in IPC format)
 
 ```es6
 import { readFileSync } from 'fs';