diff --git a/docs/BUILD.md b/docs/BUILD.md
index a8ee30a..88a6614 100644
--- a/docs/BUILD.md
+++ b/docs/BUILD.md
@@ -219,3 +219,8 @@ https://forum.openwrt.org/t/vlan-tagging-on-ipq40xx-gl-b1300-no-longer-works/695
 so that vlans work, which is needed for separate lan, wan, and backhaul
 ```
 
+Also better for ssh config in OpenWRT build, enable:
+
+```
+Base system --> Dropbear Configuration --> Ed25519 support
+```