diff --git a/README.md b/README.md
index 96dc9e9..13a1e15 100644
--- a/README.md
+++ b/README.md
@@ -12,8 +12,8 @@ Sends out newsletters
 
 2. Create an email file
     * Name it whatever you want.
-    * The first line of the file will be used as the subject.
-    * The rest of the file will be used as the body.
+    * The first line of the file will be used as {{ subject }} in the postmark template.
+    * The rest of the file will be used as {{{ content_body }}}.
     * Newlines between the subject and body will be removed.
 
 3. Do a test run
diff --git a/main.go b/main.go
index 66a16e7..5d8db16 100644
--- a/main.go
+++ b/main.go
@@ -339,8 +339,8 @@ func main() {
 
 	2. Create an email file
 		* Name it whatever you want.
-		* The first line of the file will be used as the subject.
-		* The rest of the file will be used as the body.
+		* The first line of the file will be used as {{ subject }} in the postmark template.
+		* The rest of the file will be used as {{{ content_body }}}.
 		* Newlines between the subject and body will be removed.
 
 	3. Do a test run