Added extraction method for documents in archives

Change-Id: Id4ea7d9801a5750c77f81a2251d389adb6e06d31
diff --git a/Readme.pod b/Readme.pod
index cd6258f..296cf13 100644
--- a/Readme.pod
+++ b/Readme.pod
@@ -10,8 +10,8 @@
 =head1 SYNOPSIS
 
   $ korapxml2krill -z --input <directory> --output <filename>
+  $ korapxml2krill extract --input <archive> --output <directory> --sigle <SIGLE>
   $ korapxml2krill archive -z --input <directory|archive> --output <directory>
-  $ korapxml2krill extract --input <directory|archive> --output <filename> --sigle <SIGLE>
 
 
 =head1 DESCRIPTION
@@ -161,10 +161,11 @@
 
 =item B<--sigle|-sg>
 
-Extract the given text sigles.
+Extract the given texts.
 Can be set multiple times.
 I<Currently only supported on C<extract>.>
 Sigles have the structure C<Corpus>/C<Document>/C<Text>.
+In case the C<Text> path is omitted, the whole document will be extracted.
 
 =item B<--log|-l>