diff --git a/usrguide/referenceguide/9-xsd_to_ttcn-3_converter.adoc b/usrguide/referenceguide/9-xsd_to_ttcn-3_converter.adoc
index ea394536bcbe0911ec5449374889b7fe6776c918..365888f39a5e7d424aa93aad7fa817dc817c3d09 100644
--- a/usrguide/referenceguide/9-xsd_to_ttcn-3_converter.adoc
+++ b/usrguide/referenceguide/9-xsd_to_ttcn-3_converter.adoc
@@ -30,7 +30,7 @@ An XML Schema is represented by a set of schema documents forming a complete spe
 The command line syntax of the converter is the following:
 
 [source]
-xsd2ttcn [-ceghmopstVwx] [-f file] [-J file] schema.xsd [-schema.xsd…]
+xsd2ttcn [-ceghmNopstVwx] [-f file] [-J file] schema.xsd [-schema.xsd…]
 
 or
 
@@ -69,6 +69,10 @@ Instructs the converter to generate TTCN-3 code allowing type substitution.
 +
 Instructs the converter to only generate the `UsefulTtcn3Types` and `XSD` predefined modules.
 
+* `-N`
++
+Instructs the converter to generate the definitions of XML schemas with no target namespaces into separate TTCN-3 modules (one module per XML schema). By default all definitions with no target namespace are generated into a single TTCN-3 module.
+
 * `-o`
 +
 Generates all definitions into one module, called `XSD_Definitions`, instead of generating separate modules for each target namespace. The module contains one group for each target namespace.