[Bug #793553] Correct description of keyword arguments for SSL authentication
diff --git a/Doc/lib/liburllib.tex b/Doc/lib/liburllib.tex
index 0a84c1a..75ee310 100644
--- a/Doc/lib/liburllib.tex
+++ b/Doc/lib/liburllib.tex
@@ -270,10 +270,10 @@
environmental proxy settings will be used if present, as discussed in
the definition of \function{urlopen()}, above.
-Additional keyword parameters, collected in \var{x509}, are used for
-authentication with the \file{https:} scheme. The keywords
-\var{key_file} and \var{cert_file} are supported; both are needed to
-actually retrieve a resource at an \file{https:} URL.
+Additional keyword parameters, collected in \var{x509}, may be used for
+authentication of the client when using the \file{https:} scheme. The keywords
+\var{key_file} and \var{cert_file} are supported to provide an
+SSL key and certificate; both are needed to support client authentication.
\class{URLopener} objects will raise an \exception{IOError} exception
if the server returns an error code.