diff --git a/README.md b/README.md
index fbeaa94a707f077f11332f905b7a2b3b50044187..d1c696d66edd20f19d4d40ea1f44abf804bf1145 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,6 @@ NOTE: The use of option `copy` is strongly recommended. The remaining options mo
 ## Supported Operating Systems
 * Debian 10
 * Windows 10
-RECOMMENDED: strawberry perl environment [strawberry-perl-5.30.3.1-64bit-portable](http://strawberryperl.com/releases.html). It includes `cpanm` with many preinstalled CPAN modules.
 
 ## Requirements
 * Perl version 5.28 or higher
@@ -31,7 +30,7 @@ RECOMMENDED: strawberry perl environment [strawberry-perl-5.30.3.1-64bit-portabl
   
 ## Archive::BagIt module
 * Sometimes it is offered to update module to a new version
-use `cpan Archive::BagIt`. If index not changed to a new one, try `cpanm Archive::BagIt::Fast` or `perl -MCPAN -e 'install Archive::BagIt'`
+use `cpan Archive::BagIt`. If version not changed to a new one, try `cpanm Archive::BagIt` or `perl -MCPAN -e 'install Archive::BagIt'`
   
 ## Perl module deinstallation
 Using cpanm is recommended for an assisted and clean uninstall.
@@ -53,7 +52,7 @@ Using cpanm is recommended for an assisted and clean uninstall.
 7. Extract files from archive
 8. Change console path to extracted SLUB_SIP_Builder
 9. Run tests `perl t/slubsipbuilderbagit.t` or `prove.t` and errors will come like 'Can't locate MARC/Record.pm in @INC (you may need to install the `MARC::Record` module) ...'
-10. Copy from error module name and install it, repeat point 9 and 10 till test process starts.
+10. Copy from error module name and install it, repeat step 9 and 10 till test process starts.
     * `cpanm MARC::Record`
     * `cpanm XML::XPath`
     * `cpanm DateTime::Format::ISO8601`
@@ -70,7 +69,7 @@ Using cpanm is recommended for an assisted and clean uninstall.
 
 ## Recommendation
 * Do not name your directories `data`
-* `mods.xml` and `rights.xml` file names are reserved in directory `mets`. All same file names will be renamed to `1.xml`, `2.xml` and so on
+* `marc21.xml` and `rights.xml` file names are reserved in directory `mets`. All same file names will be renamed to `1.xml`, `2.xml` and so on
 * Use absolute file and directory paths
 * If you try to execute the program for the first time, than use `save_option` copy
 
@@ -89,7 +88,7 @@ Usage:
             -save_option=<option>           payload files save as <copy>, <move>, <replace>, the <copy> option should be prefered
             -IE_directory=<IE dir>          existing IE directory (absolute path!)
             -SIP_output_path=<target dir>   where to put the SIP dir (absolute path!)
-            -ppn=<ppn>|-noppn=<noppn>       SWB-PPN or any identifier (uses minimalistic MODS)
+            -ppn=<ppn>|-noppn=<noppn>       SWB-PPN or any identifier (uses minimalistic marc21)
 
             -SIP_version=<version>          mandatory, needs for identification of SIP format, supported <v2020.1>
             -external_workflow=<workflow>   mandatory, should be uniqe workflow name
@@ -131,7 +130,7 @@ EXAMPLES
     --external_id=10008 --external_workflow=kitodo --external_ISIL=DE-14
     --external_value_descr="Gesetzlicher Auftrag" --rights_version=1.0
     --rights_xml=/metadata/rights/Fallbeispiel-01.xml
-    --add_meta_file=/metadata/lido.xml --add_meta_file=/metadata/mods.xml
+    --add_meta_file=/metadata/lido.xml --add_meta_file=/metadata/marc21.xml
     --add_key_value="Author:Lew Nikolajewitsch Tolstoi"
     --add_key_value="Titel:Krieg und Frieden" --add_key_value="Genre:Roman"