diff --git a/README.md b/README.md
index 568f652..22c8a48 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@ A writable stream for bulk indexing records in Elasticsearch
 
 # Usage
 
+## Format
+
 The records written to the stream has to have the following format:
 ```javascript
 {
@@ -21,6 +23,8 @@ The records written to the stream has to have the following format:
 }
 ```
 
+## Buffering
+
 The `highWaterMark` option set on the stream defines how many items
 will be buffered before doing a bulk indexing operation. The stream
 will also write all buffered items if its is closed, before emitting