Document empty namespace mapping

README.md

@@ -51,14 +51,16 @@ For command line use, choose your preferred installation:
 ```
 Usage: xscgen [OPTIONS]+ xsdFile...
 Generate C# classes from XML Schema files.
-Version 2.0.792.0
+Version 2.0.877.0
 xsdFiles may contain globs, e.g. "content\{schema,xsd}\**\*.xsd", and URLs.
 Append - to option to disable it, e.g. --interface-.
 
 Options:
  -h, --help show this message and exit
  -n, --namespace=VALUE map an XML namespace to a C# namespace
  Separate XML namespace and C# namespace by '='.
+ A single value (no '=') is taken as the C#
+ namespace the empty XML namespace is mapped to.
  One option must be given for each namespace to
  be mapped.
  A file name may be given by appending a pipe
@@ -229,10 +231,10 @@ xscgen -n "|a.xsd=Example.NamespaceA" -n "|b.xsd=Example.NamespaceB" a.xsd b.xsd
 In order to provide a C# namespace name for an empty XML namespace you can specify it on the command line like this:
 
 ```
-xscgen -n =Example example.xsd
+xscgen -n Example example.xsd
 ```
 
-Note the space between `-n` and `=Example`.
+An alternative form that is also valid is `-n =Example`. Note the space between `-n` and `=Example`.
 
 #### Using mapping files