diff --git a/README.md b/README.md
index 758bbfd..3acc119 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # OS2Forms Digital Post
 
 Send Digital Post to danish citizens from a webform.
+This module use the [SF1600](https://digitaliseringskataloget.dk/integration/sf1600) service from Serviceplatformen. Information and documentation can be obtained by following that link.
 
 ## Installation
 
@@ -98,4 +99,4 @@ A drush command is available for testing purposes. It creates a PDF from a templ
 Read more:
 ```shell
 drush os2forms_digital_post:create_pdf --help
-```
\ No newline at end of file
+```