diff --git a/README.md b/README.md
index a550dc1..2778522 100644
--- a/README.md
+++ b/README.md
@@ -134,6 +134,8 @@ ssh-keygen -t ed25519 -f ssh_host_ed25519_key < /dev/null
 ssh-keygen -t rsa -b 4096 -f ssh_host_rsa_key < /dev/null
 ```
 
+Be sure to generate keys with no passphrase, or they will not be loaded properly when the container starts.
+
 ## Execute custom scripts or applications
 
 Put your programs in `/etc/sftp.d/` and it will automatically run when the container starts.