diff --git a/How-to-run-on-OpenWrt.md b/How-to-run-on-OpenWrt.md
index 0cab841..0246a52 100644
--- a/How-to-run-on-OpenWrt.md
+++ b/How-to-run-on-OpenWrt.md
@@ -1,3 +1,5 @@
+**See [OpenWrt Wiki: Get a free HTTPS certificate from LetsEncrypt for OpenWrt with ACME.sh](https://openwrt.org/docs/guide-user/services/tls/acmesh)**
+
 Setup and run acme.sh on your [OpenWrt](https://openwrt.org) router and have HTTPS secured management.
 
 ### Step 1: Install packages