diff --git a/bibliotheca/Taskfile.yml b/bibliotheca/Taskfile.yml
index 86ba68d..693075a 100644
--- a/bibliotheca/Taskfile.yml
+++ b/bibliotheca/Taskfile.yml
@@ -126,7 +126,8 @@ tasks:
         "$CLIENT" -P {{.PORT}} {{.PROJECT}} --apply config/main/7100a.json > {{.LOG}}
       - > # spec_B_T_04, spec_B_T_05: ISBN 2000
         "$CLIENT" -P {{.PORT}} {{.PROJECT}} --apply config/main/2000.json > {{.LOG}}
-        # TODO: ISMN in 2020
+      - > # spec_B_T_04, spec_B_T_05: ISMN 2020
+        "$CLIENT" -P {{.PORT}} {{.PROJECT}} --apply config/main/2020.json > {{.LOG}}
       - > # spec_B_E_10: Zugangsdatum E0XX
         "$CLIENT" -P {{.PORT}} {{.PROJECT}} --apply config/main/e0xx.json > {{.LOG}}
       - > # spec_B_E_14, spec_Z_03, spec_B_E16: Selektionsschlüssel E0XXb
diff --git a/bibliotheca/config/main/2020.json b/bibliotheca/config/main/2020.json
new file mode 100644
index 0000000..be9ef0c
--- /dev/null
+++ b/bibliotheca/config/main/2020.json
@@ -0,0 +1,34 @@
+[
+  {
+    "op": "core/column-addition",
+    "engineConfig": {
+      "facets": [
+        {
+          "type": "list",
+          "name": "M|ISBN",
+          "expression": "grel:value[0]",
+          "columnName": "M|ISBN",
+          "invert": false,
+          "omitBlank": false,
+          "omitError": false,
+          "selection": [
+            {
+              "v": {
+                "v": "M",
+                "l": "M"
+              }
+            }
+          ],
+          "selectBlank": false,
+          "selectError": false
+        }
+      ],
+      "mode": "row-based"
+    },
+    "baseColumnName": "M|ISBN",
+    "expression": "grel:value",
+    "onError": "set-to-blank",
+    "newColumnName": "2020",
+    "columnInsertIndex": 3
+  }
+]
diff --git a/bibliotheca/config/main/template.txt b/bibliotheca/config/main/template.txt
index 8741cde..2aba7b7 100644
--- a/bibliotheca/config/main/template.txt
+++ b/bibliotheca/config/main/template.txt
@@ -19,6 +19,7 @@ with(
     '1140',
     '1500',
     '2000',
+    '2020',
     '4000a',
     '4000d',
     '4020a',
diff --git a/pica+/config/template.txt b/pica+/config/template.txt
index b085025..b9d1388 100644
--- a/pica+/config/template.txt
+++ b/pica+/config/template.txt
@@ -8,6 +8,7 @@ if(row.index - row.record.fromRowIndex == 0,
 + forNonBlank(cells['0100'].value, v, '003@ ' + '0' + v + '\n', '')
 + forNonBlank(cells['0110'].value, v, '003S ' + '0' + v + '\n', '')
 + forNonBlank(cells['2000'].value, v, forEach(v.split('␟'),x,'004A ' + '0' + x + '\n').join(''), '')
++ forNonBlank(cells['2020'].value, v, '004F ' + '0' + v + '\n', '')
 + forNonBlank(cells['2199'].value, v, forEach(v.split('␟'),x,'006Y ' + '0' + x + '\n').join(''), '')
 + forNonBlank(cells['1500'].value, v, '010@ ' + forEach(v.split('␟'),x,'a' + x).join('') + '\n', '')
 + forNonBlank(cells['1100a'].value, v, '011@ ' + 'a' + v + forNonBlank(cells['1100b'].value, v, 'b' + v, '') + forNonBlank(cells['1100n'].value, v, 'n' + v, '') + '\n', '')