diff --git a/README.md b/README.md
index 1c31e2b..994046f 100644
--- a/README.md
+++ b/README.md
@@ -55,3 +55,8 @@ or:
     phpunit -c phpunit.integration.xml
 
 for integration tests
+
+## Using the app
+Currently only the "Document name" filter is available. 
+
+{filename} and {user} smart variables can be used when configuring the mail.