diff --git a/src/AasxPluginExportTable/Smt/ExportSmt.cs b/src/AasxPluginExportTable/Smt/ExportSmt.cs
index 419e010e..d2415214 100644
--- a/src/AasxPluginExportTable/Smt/ExportSmt.cs
+++ b/src/AasxPluginExportTable/Smt/ExportSmt.cs
@@ -406,6 +406,8 @@ public void ExportSmtToFile(
                         ProcessTextBlob("=== ", blob);
                     if (semId.Matches(defs.CD_Heading3.GetCdReference(), mm))
                         ProcessTextBlob("==== ", blob);
+                    if (semId.Matches(defs.CD_Heading4.GetCdReference(), mm))
+                        ProcessTextBlob("===== ", blob);
                 }
 
                 if (sme is Aas.IFile || sme is Aas.IBlob)
diff --git a/src/AasxPredefinedConcepts/Definitions/DefinitionsAsciiDoc.cs b/src/AasxPredefinedConcepts/Definitions/DefinitionsAsciiDoc.cs
index a49b3b31..7b7d0f96 100644
--- a/src/AasxPredefinedConcepts/Definitions/DefinitionsAsciiDoc.cs
+++ b/src/AasxPredefinedConcepts/Definitions/DefinitionsAsciiDoc.cs
@@ -28,6 +28,7 @@ public Aas.ConceptDescription
             CD_Heading1,
             CD_Heading2,
             CD_Heading3,
+            CD_Heading4,
             CD_ImageFile,
             CD_GenerateUml,
             CD_GenerateTables;
@@ -67,6 +68,11 @@ public AsciiDoc()
                 "http://admin-shell.io/aasx-package-explorer/functions/asciidoc/heading3/1/0",
                 @"Heading with level 3 in AsciiDoc. That is: sub sub section.");
 
+            CD_Heading4 = CreateSparseConceptDescription("en", "IRI",
+                "Heading4",
+                "http://admin-shell.io/aasx-package-explorer/functions/asciidoc/heading4/1/0",
+                @"Heading with level 4 in AsciiDoc. That is: sub sub sub section.");
+
             CD_ImageFile = CreateSparseConceptDescription("en", "IRI",
                 "ImageFile",
                 "http://admin-shell.io/aasx-package-explorer/functions/asciidoc/imagefile/1/0",