1 files changed, 17 insertions, 1 deletions
diff --git a/install/INSTALL.txt b/install/INSTALL.txt
index 65efa9cfe..c23cf740e 100644
--- a/install/INSTALL.txt
+++ b/install/INSTALL.txt
@@ -33,7 +33,23 @@ Put some thought into this - because changing it is currently not-supported.
 Things will break, and some of your friends may have difficulty communicating
 with you. We plan to address this limitation in a future release. 
 
-Decide if you will use SSL and obtain an SSL cert before software installation. You SHOULD use SSL. If you use SSL, you MUST use a "browser-valid" certificate. Please test your certificate prior to installation. A web tool for testing your certificate is available at "http://www.digicert.com/help/". When visiting your site for the first time, please use the SSL ("https://") URL if SSL is available. This will avoid problems later.  
+Decide if you will use SSL and obtain an SSL certificate before software
+installation.  You SHOULD use SSL. If you use SSL, you MUST use a
+"browser-valid" certificate.  You MUST NOT use self-signed certificates!
+
+Please test your certificate prior to installation. A web tool for testing your
+certificate is available at "http://www.digicert.com/help/". When visiting your
+site for the first time, please use the SSL ("https://") URL if SSL is
+available. This will avoid problems later. The installation routine will not
+allow you to use a non browser-valid certificate.
+
+This restriction is incorporated because public posts from you may for example
+contain references to images on your own hub. If your certificate is not known
+by the internet browser of users they get a warning message complaining about
+some security issues. Although these complains are not the real truth - there
+are no security issues with your encryption! - the users may be confused,
+nerved or even worse may become scared about Red Matrix having security issues.
+Use one of the free certification instances!
  
 
 1. Requirements