diff --git a/usage.org b/usage.org
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@@ -315,4 +315,17 @@ When the install is complete you will see a lot of warnings but just ignore thos
 | User settings   | Bio limit 1000                   |
 | Access settings | /Invite only/ ticked             |
 * Social Network
+** Certificates
+You will need to have a non self-signed SSL certificate in order to use Red Matrix. Put the public certificate in */etc/ssl/certs/yourredmatrixdomainname.crt* and the private certificate in */etc/ssl/private/yourredmatrixdomainname.key*. If there is an intermediate certificate needed (such as with StartSSL) then this will need to be concatenated onto the end of the crt file, like this:
+
+#+BEGIN_SRC bash
+cat /etc/ssl/certs/yourredmatrixdomainname.crt /etc/ssl/chains/startssl-sub.class1.server.ca.pem >
+ /etc/ssl/certs/yourredmatrixdomainname.bundle.crt
+#+END_SRC
+
+Then change ssl_certificate to */etc/ssl/certs/yourredmatrixdomainname.bundle.crt* within */etc/nginx/sites-available/yourredmatrixdomainname*
+** Initial install
+Visit the URL of your Red Matrix site and you should be taken through the rest of the installation procedure.  Note that this may take a few minutes so don't be concerned if it looks as if it has crashed - just leave it running.
+
+When installation is complete you can register a new user.
 * Chat Services