diff --git a/README.md b/README.md
index 4575e5b..2616b57 100644
--- a/README.md
+++ b/README.md
@@ -117,6 +117,25 @@ docker run \
     foo::1001
 ```
 
+## Using custom SSH key for server
+
+This container will generate an ssh-key for OpenSSH at first run. To avoid this, you can map Ed25519 or RSA keys from the host inside the container.
+
+```
+docker run \
+    -v /host/ssh_host_ed25519_key:/etc/ssh/ssh_host_ed25519_key \
+    -v /host/ssh_host_rsa_key:/etc/ssh/ssh_host_rsa_key \
+    -v /host/share:/home/foo/share \
+    -p 2222:22 -d atmoz/sftp \
+    foo::1001
+```
+
+Tip: you can generate keys with this commands:
+```
+ssh-keygen -t ed25519 -f /host/ssh_host_ed25519_key < /dev/null
+ssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key < /dev/null
+```
+
 ## Execute custom scripts or applications
 
 Put your programs in `/etc/sftp.d/` and it will automatically run when the container starts.