diff --git a/README.md b/README.md
index 6125b90..9d3e907 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ A little service to send e-mail.
 
 ## Build
 ```bash
-make
+make build
 ```
 
 ## Configuration
@@ -25,15 +25,22 @@ outbox_path = "<dir_path>" # directory used to retrieve `.json` e-mail format to
 ```
 
 ## How to send a mail ?
+### JSON file
 * create a JSON file like:
 ```json
 {
         "sender":"<email>",
-        "receivers": ["<email_1>","<email_2>", ..., "<email_n>"],
+        "receivers": "<email_1>,<email_2>, ..., <email_n>",
         "subject": "<subject>",
         "content": "<mail_content>"
 }
 ```
-* put the JSON file in the `outbox` directory define in the `.ini` file
+* put the JSON file in the `outbox` directory defined in the `.ini` file.
 
-**NOTE**: HTML is interpreted for the e-mail content
+### HTTP
+An http server is embedded inside `mailsrv` and is listening on port **1212**. To send an email you can post a JSON to **/mail**:
+```
+curl http://localhost:1212/mail -d '{"sender":"test@test.com","receivers":"test1@test.com,test2@test.com","subject":"test","content":"<h1>test</h1>"}'
+```
+
+**NOTE**: HTML is interpreted for the e-mail content.