diff --git a/etc/nginx/README.md b/etc/nginx/README.md
index de59b13f..35c593c8 100644
--- a/etc/nginx/README.md
+++ b/etc/nginx/README.md
@@ -1,6 +1,45 @@
 Useful nginx files that I will probably need and which I will forget if I
 cannot read them from here.
 
+* * * * *
+
+## FUTURE WARNING
+
+These files may age badly, so here are some hopefully timeless pointers:
+
+* Generate the config file with https://ssl-config.mozilla.org/ (and if
+  time eats it, try https://github.com/mozilla/ssl-config-generator/ in
+  hope of finding where it is now.
+      * Name it 00-something so it will be the first file read and make
+        everything a different file.
+* If using my acmesh-ssl.bash script, the files to fill should be like:
+
+(the script runs `$ACMESH --key-file $NGINXDIR/key.pem --fullchain-file $NGINXDIR/cert.pem --reloadcmd "$SYSTEMCTLRESTART nginx"`)
+
+* `ssl_certificate`, `ssl_trusted_certificate` are `cert.pem`
+* `ssl_certificate_key` is `key.pem`
+
+The header syntax is following, ***THIS LIKELY WON'T TIME WELL, ESPECIALLY CSP***
+
+```
+    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains" always;
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header Content-Security-Policy "block-all-mixed-content; default-src 'none'; form-action 'self'; connect-src 'self' ws: wss:; style-src 'self' https: 'unsafe-inline'; script-src 'self'; worker-src 'self'; child-src 'self'; manifest-src 'self'; font-src 'self' https:; media-src 'self' https:; img-src 'self' data: https://user-images.githubusercontent.com" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header Referrer-Policy "no-referrer" always;
+```
+
+The CSP comes from `HEAD "http://[::]:9000/#/chan-1"` to figure out what
+TheLounge would be setting without a reverse proxy in front of it. `HEAD` is
+in Debian package `libwww-perl`
+
+* Refer to tester tools to see if the configuration is fine:
+    * https://observatory.mozilla.org/
+    * https://securityheaders.com/
+    * https://www.ssllabs.com/ssltest/
+
+* * * * *
+
 ## Arch
 
 Remove the default server block and add to http block: