Explain namespace mapping file option

README.md

@@ -65,6 +65,13 @@ Options:
  xsd) to the XML namespace.
  If no mapping is found for an XML namespace, a
  name is generated automatically (may fail).
+ --nf, --namespaceFile=VALUE
+ file containing mapppings from XML namespaces to C#
+ namespaces
+ The line format is one mapping per line: XML
+ namespace = C# namespace [optional file name].
+ Lines starting with # and empty lines are
+ ignored.
  -o, --output=FOLDER the FOLDER to write the resulting .cs files to
  -i, --integer=TYPE map xs:integer and derived types to TYPE instead
  of automatic approximation
@@ -208,6 +215,20 @@ xscgen -n =Example example.xsd
 
 Note the space between `-n` and `=Example`.
 
+#### Using mapping files
+
+Instead of specifying the namespace mappings on the command line you can also use a mapping file which should contain one mapping per line in the following format:
+
+```
+# Comment
+
+http://example.com = Example.NamespaceA a.xsd
+http://example.com = Example.NamespaceB b.xsd
+= Empty
+```
+
+Use the `--nf` option to specify the mapping file.
+
 Nullables<a name="nullables"></a>
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