diff --git a/README.md b/README.md
index e015f29..312b645 100644
--- a/README.md
+++ b/README.md
@@ -96,6 +96,34 @@ SSH into server admin account and run:
     $ cd www
     $ dehydrated --config config -c
 
+Then restart the OpenResty service:
+
+    $ sudo service openresty restart
+
+#### automate TSL cert renewal
+
+##### renew TSL certs
+
+Open crontab:
+
+    $ crontab -e
+
+Add the following line, then save and exit:
+
+    19 4 1 * * /usr/bin/dehydrated --config /var/www/config --cron >/dev/null 2>&1
+
+##### restart service
+
+Open root's crontab:
+
+    $ sudo crontab -e
+
+Add the following line:
+
+    @monthly /usr/bin/systemctl restart openresty.service
+
+Save and exit.
+
 ## gotchas
 
 ### What is error `cosmo failed: [string "..."]:62: cannot resume dead coroutine`?
@@ -119,3 +147,11 @@ Delete your `.sitegen_cache` file.
 * use sitecache with pandoc renderer
 * draft documents
 * treesitter highlighting for moonscript
+
+## todo
+
+* destroy a target ship by shooting them with the cannon
+* make corners not bouncy (leave them bouncy for now?)
+* wall entities
+* ship-ship collision
+* make ssh command?