diff --git a/README.md b/README.md
index 5b06add..e59508c 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,13 @@ example:
 
     $ make deploy
 
+### renew server TSL certs
+
+SSH into server admin account and run:
+
+    $ cd www
+    $ dehydrated --config config -c
+
 ## gotchas
 
 ### What is error `cosmo failed: [string "..."]:62: cannot resume dead coroutine`?