diff --git a/metadata-readme/Personal-documents-Berg-metadata-readme.md b/metadata-readme/Personal-documents-Berg-metadata-readme.md
index 3005c0c3bce5e96162e30eeb4ea29e11063b3cac..73a9ccde82765e26ea7a926116328cf7044052e8 100644
--- a/metadata-readme/Personal-documents-Berg-metadata-readme.md
+++ b/metadata-readme/Personal-documents-Berg-metadata-readme.md
@@ -10,10 +10,10 @@ Please note that the CSV is an export of keys and values of the Relational Datab
 | barcode | ID of the document; At the Austrian National Library every digitized document in this collection has a barcode as identifier for the digitized item, usually in the form \"\+Z\d{7}[0-9, A-Z]{1,2}" | all | string |
 | signature | shelfmark of document in collection of the Austrian National Library, for documents of the estate Alban Berg "F21.Berg.*"| all | string |
 | location | code for collection department at the Austrian National Library; "MUS MAG" stands for the Music Department | some | string |
-| urns | | none | string |
+| urns | ID in the form of a Uniform Resource Name | none | string |
 | snISBN | International Standard Book Number | none | string |
 | snISSN | International Standard Serial Number | none | string |
-| volumeNumber | | some | string |
+| volumeNumber | number of volume as part of a multivolumed resource | none | string |
 | languages | code for langauge of the document in ISO-639 3  | some | string |
 | main_title | title of the document, either as in the resource or a fictious title | all | string |
 | sub_title | subtitle of the document, either as in the resource or a fictious subtitle | some | string |
@@ -24,11 +24,11 @@ Please note that the CSV is an export of keys and values of the Relational Datab
 | publishers | personal name of publisher if known | none | string |
 | placesOfPublication | placename for place of creation or place of publication, not linked to authority file; "Ohne Ort" stands for "no placename known"; Cave: Those entries that do not have a value do not necessarely have no place of publication | some | string |
 | yearOfPublication | either a year, a range of years separated by a hyphen or "[ohne Datumsangabe]" for documents without date | some | string |
-| dateOfPublication |  | none | integer |
+| dateOfPublication | year of publication in integer format | none | integer |
 | Subjects | subject terms in German as used in the RSWK (Regeln für Schlagwortkatalogisierung), usually in the form of the GND authority file; the subject term can also be a term for a document type (e.g. "Lebensdokument"); Please note that the subject terms are not fully consistent within the dataset | most | string |
 | GND-Links | URLs (PIDs) for GND-referenced subject terms; multiple values are comma separated | most | string |
 | gndReferences | | some | string |
-| classifications |  | none | string |
+| classifications | NA | none | string |
 | contentInformations | any information on the content of the document, e.g. if illustrated or the coverage | most | string |
 | physicalPages | any information on the coverage of the document (Umfang); The value may be identical to the value in "contentInformations" | most | string |
 | illustrations | information on the illustrations; please refer to the attribute "contentInformations" | none | string |