diff --git a/cyclonedx_py/_internal/utils/mimetypes.py b/cyclonedx_py/_internal/utils/mimetypes.py
index 6ac49b08..0d447c42 100644
--- a/cyclonedx_py/_internal/utils/mimetypes.py
+++ b/cyclonedx_py/_internal/utils/mimetypes.py
@@ -29,6 +29,7 @@
     '.md': 'text/markdown',
     '.txt': 'text/plain',
     '.rst': 'text/prs.fallenstein.rst',
+    '.rtf': 'application/rtf',
     '.xml': 'text/xml',  # not `application/xml` -- our scope is text!
     # license-specific files
     '.license': _MIME_TEXT_PLAIN,