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 delete request;
 ```
 
+**Note:** You can get the root CA for a domain easily from Firefox. Click on the green padlock, click *More information > Security > View certificate > Details*. Select the top entry in the 'Certificate Hierarchy' and click *Export...*. This gives you a PEM file. Add the content of the PEM file to your root CA list ([here's an image](img/root-ca-selection.png)).
+
 ## Memory usage
 
 Small requests where the body of the response is cached by the library (like the one found in main-http.cpp), require ~4K of RAM. When the request is finished they require ~1.5K of RAM, depending on the size of the response. This applies both to HTTP and HTTPS. If you need to handle requests that return a large response body, see 'Dealing with large body'.