- updated, see #317

etc/README.md

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+
+#### Certification stores
+
+The certificate stores were retrieved by
+
+* Mozilla; see https://curl.haxx.se/docs/caextract.html
+* Linux: Just copied from a uptodate Linux machine
+* Microsoft: under Windows >= 7,2008 MS decided not to provide
+  a full certificate store. It's being populated with time --
+  supposed you use e.g. IE while browsing. This store was destilled
+  from three different windows installations via certmgr.msc and
+  export of "Trusted Root Certification Authorities"  --> "Certificates".
+  Third Party Root Certificates were deliberately omitted.
+
+In this directory you can also save e.g. your company Root CAs in PEM 
+format.  You will still get a warning for the other certificate stores 
+though while scanning internal networks. If you scan other hosts in the 
+internet the check against your Root CA will fail, too. This will be
+fixed in the future, see #230.
+
+#### Mapping file
+
+The file mapping-rfc.txt uses the hexcode to map OpenSSL names
+against the RFC/IAMA names