diff --git a/README.md b/README.md
index df49d07..375176e 100644
--- a/README.md
+++ b/README.md
@@ -437,6 +437,15 @@ For example:
 'http://myhost.site/expense' http-post 
 ```
 
+You can also specify HTTP headers by adding a `headers` key to the map. In this case you should put the body under the `content' key.
+
+```forth
+#[
+  'headers' #[ <key> <value> ]#
+  'content' #[ .. ]#
+]#
+```
+
 ### Examples
 
 #### Controlling a Daikin Air Conditioner