diff --git a/README.md b/README.md
index 0f9510d..f96e4a7 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,12 @@ run on a server.
 
 hydroxide supports CardDAV and SMTP.
 
+Rationale:
+
+* No GUI, only a CLI (so it runs in headless environments)
+* Standard-compliant (we don't care about Microsoft Outlook)
+* Fully open-source
+
 ## Usage
 
 Your credentials will be stored on disk encrypted with a 32-byte random