diff --git a/docs/dovecot.md b/docs/dovecot.md
index 3f87e2f..2eb3024 100644
--- a/docs/dovecot.md
+++ b/docs/dovecot.md
@@ -31,6 +31,9 @@ accordingly.
 
 This lets chasquid issue authentication requests to dovecot.
 
+Authentication requests sent by chasquid to dovecot will use the
+fully-qualified user form, `user@domain`.
+
 
 ## Configuring chasquid